8
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
WOW, great find! and awesome pictures documenting the score!
those tall deck blocks get over looked by many but I prefer them to almost any other for a muscle car power plant, and the condition you found it in is rather exceptional !
WOW, great find! and awesome pictures documenting the score!
those tall deck blocks get over looked by many but I prefer them to almost any other for a muscle car power plant, and the condition you found it in is rather exceptional !
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
I never knew what I had for 15 years Grumpy.
The GM Dealership It came from & I worked at is long gone. Building torn down.
My old Boss passed on in 1999.
Unsolved Mystery.
I don't see how the shortblock ever ran do you Grumpy ??
Found MOROSO TALL DECK INTAKE ADAPTER SPACERS.
Need your help knowing Balancer & Flexplate required.
Neutral Balance, Assemetrical , Ect.
Thinking of using in my 1963 Pontiac Grand Prix for now as is.
Purchase an Isky Hyd Cam Grind.
I am Loyal to Isky & Crower.
It has Forged Pistons stock. 4- rings but who cares.
Keep it at 5,000-5500.
I never knew what I had for 15 years Grumpy.
The GM Dealership It came from & I worked at is long gone. Building torn down.
My old Boss passed on in 1999.
Unsolved Mystery.
I don't see how the shortblock ever ran do you Grumpy ??
Found MOROSO TALL DECK INTAKE ADAPTER SPACERS.
Need your help knowing Balancer & Flexplate required.
Neutral Balance, Assemetrical , Ect.
Thinking of using in my 1963 Pontiac Grand Prix for now as is.
Purchase an Isky Hyd Cam Grind.
I am Loyal to Isky & Crower.
It has Forged Pistons stock. 4- rings but who cares.
Keep it at 5,000-5500.
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
those head castings are decent but the factory installed valves tend to be the smaller size with 2.08 and 1.72" valves, flow can be greatly improved with larger (usually longer)valves , better valve springs and larger valve seats installed and matching port and bowl clean-up but obviously that costs time and money.
there ARE performance intakes that you can install with or without spacers
IF your going to build a big block Chevy it usually helps to know your options and longer strokes and rods help.
Id also point out that doing the math before you purchase parts will save you a great deal of wasted cash,
and if that engine your contemplating is intended to exceed about 4200 feet per minute in piston speed or 6200rpm,
you might want too think seriously about 4340 forged steel crank, forged pistons, and rods with 7/16" ARP rod bolts
youll generally want to build a tall deck, engine with longer connecting rods to take full advantage of the tall deck architecture
the deck heights .400 taller so youll generally want connecting rods that are longer on the 4.25", stroke , stroker crank
IVE GENERALLY USED SCAT CRANK ROTATING ASSEMBLIES WITH 7/16" ARP ROD BOLTS and 6.385" 0r 6.535" rods as they are longer to compensate for the .400 taller deck height, a call to SCAT will get you the correct part number for a kit forged and internally balanced rotating assembly kit Phone: 310 370 5501
http://www.jegs.com/i/Eagle/356/11512100/10002/-1?parentProductId=
http://www.superchevy.com/how-to/project-cars/0704ch-chevy-big-block/
http://www.scatcrankshafts.com/rotating-assembies/chevy-rotating-assemblies/
http://garage.grumpysperformance.co...r-heads-or-piston-dome-volume.2077/#post-9049
http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/page-2#post-49183
http://garage.grumpysperformance.com/index.php?threads/deck-height-problems.3048/#post-8049
http://garage.grumpysperformance.com/index.php?threads/build-a-496-stroker-bbc.101/#post-49427
http://garage.grumpysperformance.com/index.php?threads/a-mid-range-454-bbc-build.8215/#post-54632
http://scatcrankshafts.com/
common BB CHEVY piston compression heights are
1.270"
1.395"
1.520"
1.645"
1.765"
remember the blocks deck height, minus the piston pin height minus 1/2 the crank stroke will equal the required connecting rod length
OR
the blocks deck height, minus the connecting rod length, minus 1/2 the crank stroke. will equal the required piston pin height
yes its common for a combo to have the piston deck height located .010-.015 above or below the deck of the block so you'll need to select a head gasket thickness that compensates, too allow your engine to get a .038-.044 piston deck to cylinder head QUENCH DISTANCE.
those head castings are decent but the factory installed valves tend to be the smaller size with 2.08 and 1.72" valves, flow can be greatly improved with larger (usually longer)valves , better valve springs and larger valve seats installed and matching port and bowl clean-up but obviously that costs time and money.
there ARE performance intakes that you can install with or without spacers
IF your going to build a big block Chevy it usually helps to know your options and longer strokes and rods help.
Id also point out that doing the math before you purchase parts will save you a great deal of wasted cash,
and if that engine your contemplating is intended to exceed about 4200 feet per minute in piston speed or 6200rpm,
you might want too think seriously about 4340 forged steel crank, forged pistons, and rods with 7/16" ARP rod bolts
youll generally want to build a tall deck, engine with longer connecting rods to take full advantage of the tall deck architecture
the deck heights .400 taller so youll generally want connecting rods that are longer on the 4.25", stroke , stroker crank
IVE GENERALLY USED SCAT CRANK ROTATING ASSEMBLIES WITH 7/16" ARP ROD BOLTS and 6.385" 0r 6.535" rods as they are longer to compensate for the .400 taller deck height, a call to SCAT will get you the correct part number for a kit forged and internally balanced rotating assembly kit Phone: 310 370 5501
http://www.jegs.com/i/Eagle/356/11512100/10002/-1?parentProductId=
http://www.superchevy.com/how-to/project-cars/0704ch-chevy-big-block/
http://www.scatcrankshafts.com/rotating-assembies/chevy-rotating-assemblies/
http://garage.grumpysperformance.co...r-heads-or-piston-dome-volume.2077/#post-9049
http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/page-2#post-49183
http://garage.grumpysperformance.com/index.php?threads/deck-height-problems.3048/#post-8049
http://garage.grumpysperformance.com/index.php?threads/build-a-496-stroker-bbc.101/#post-49427
http://garage.grumpysperformance.com/index.php?threads/a-mid-range-454-bbc-build.8215/#post-54632
http://scatcrankshafts.com/
common BB CHEVY piston compression heights are
1.270"
1.395"
1.520"
1.645"
1.765"
remember the blocks deck height, minus the piston pin height minus 1/2 the crank stroke will equal the required connecting rod length
OR
the blocks deck height, minus the connecting rod length, minus 1/2 the crank stroke. will equal the required piston pin height
yes its common for a combo to have the piston deck height located .010-.015 above or below the deck of the block so you'll need to select a head gasket thickness that compensates, too allow your engine to get a .038-.044 piston deck to cylinder head QUENCH DISTANCE.
Last edited by a moderator:
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
This does not have to make 600 HP & Launch doing wheelstands Grumpy.
If it can match 360 HP & 470 Ft/lbs torque of the Olds 425 Its good enough.
427 Tall deck BBC is rated at 8.0:1 static compression.
Good canidate for 87 octane gasoline.
Daul plane intake.
Have a nearby source for BBC Parts .
At least 30 BBC 396, 427, &454 Low decks .
Get my exhaust manifolds, pulleys, accessory brackets.
Moving parts on ebay.
Some have told me the 65 Olds 425 is valuable.
All original .
This does not have to make 600 HP & Launch doing wheelstands Grumpy.
If it can match 360 HP & 470 Ft/lbs torque of the Olds 425 Its good enough.
427 Tall deck BBC is rated at 8.0:1 static compression.
Good canidate for 87 octane gasoline.
Daul plane intake.
Have a nearby source for BBC Parts .
At least 30 BBC 396, 427, &454 Low decks .
Get my exhaust manifolds, pulleys, accessory brackets.
Moving parts on ebay.
Some have told me the 65 Olds 425 is valuable.
All original .
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
Like to keep the 425. Olds best ever many say.
Have other Rocket engines & parts to sell.
Like to keep the 425. Olds best ever many say.
Have other Rocket engines & parts to sell.
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
Ihave been searching for used hardware to complete the 427 Tall Deck BBC Grumpy.
Not easiest to find on the NET.
Like to make it run later this year
Ihave been searching for used hardware to complete the 427 Tall Deck BBC Grumpy.
Not easiest to find on the NET.
Like to make it run later this year
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
http://www.summitracing.com/parts/wnd-8206/overview/
http://www.summitracing.com/parts/mor-65090/overview/
I've frequently found these 3/8" thick intake spacer plates that allow standard big block intakes to fit the tall deck blocks for $40-$80 at swap meets so look around before paying full ticket prices.
youll need longer push rods than standard length if you need new ones so measure length and rocker geometry carefully
youll want a distributor with adjustable height locking collar
http://www.circletrack.com/techarticles ... tools.html
http://www.msdignition.com/Products/Dis ... butor.aspx
https://www.cpperformance.com/instructions/121-3560.pdf
http://www.smileysracing.com/shopping/p ... =20124&c=0
http://www.huntmagnetos.com/products/slip-collar.html
if you have access to a lathe, a lot of standard distributors can be modified to have a slide/slip locking height adjustment collar installed after the old fixed collars machined off
http://www.summitracing.com/parts/msd-85561
viewtopic.php?f=51&t=188&p=1634&hilit=tall+deck+block#p1634
viewtopic.php?f=51&t=2692&p=8174&hilit=tall+deck#p8174
viewtopic.php?f=69&t=5123
http://www.summitracing.com/parts/wnd-8206/overview/
http://www.summitracing.com/parts/mor-65090/overview/
I've frequently found these 3/8" thick intake spacer plates that allow standard big block intakes to fit the tall deck blocks for $40-$80 at swap meets so look around before paying full ticket prices.
youll need longer push rods than standard length if you need new ones so measure length and rocker geometry carefully
youll want a distributor with adjustable height locking collar
http://www.circletrack.com/techarticles ... tools.html
http://www.msdignition.com/Products/Dis ... butor.aspx
https://www.cpperformance.com/instructions/121-3560.pdf
http://www.smileysracing.com/shopping/p ... =20124&c=0
http://www.huntmagnetos.com/products/slip-collar.html
if you have access to a lathe, a lot of standard distributors can be modified to have a slide/slip locking height adjustment collar installed after the old fixed collars machined off
http://www.summitracing.com/parts/msd-85561
viewtopic.php?f=51&t=188&p=1634&hilit=tall+deck+block#p1634
viewtopic.php?f=51&t=2692&p=8174&hilit=tall+deck#p8174
viewtopic.php?f=69&t=5123
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
I have a couple Chevy Vertex OAC Mags Grumpy.
I can machine down for an adjustable slip collar on a South Bend Heavy 10 Lathe.
Have 3 & 4 Jaw independent lathe chucks.
Be an easy job.
Hunt adjustable slip collar affordable.
Have to check & see When Jefferson, Wisconsinn Vintage car swap meet is coming up exavct.
Its huge.
Been there many times.
Takes 8-10 hours to see it all. Landed good deals in the past there.
Check out more links tonight.
I have a couple Chevy Vertex OAC Mags Grumpy.
I can machine down for an adjustable slip collar on a South Bend Heavy 10 Lathe.
Have 3 & 4 Jaw independent lathe chucks.
Be an easy job.
Hunt adjustable slip collar affordable.
Have to check & see When Jefferson, Wisconsinn Vintage car swap meet is coming up exavct.
Its huge.
Been there many times.
Takes 8-10 hours to see it all. Landed good deals in the past there.
Check out more links tonight.
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
I am still thing of this 427 Tall Deck BBC for use in the 1963 Pontiac Grand Prix.
Running as is without Stroking to a 496 ci.
In stock form It has comparable HP & Torque to a run of the mill 1971-76 Pontiac 455.
Actually a hair more.
Run on piss water 87 octane gas as is. Definition of True daily driver affordability of driving 50 to 500 miles any time any where.
Factory HP & Torque was done with a Governed Holley Carb of maybe 450 cfm rating & crap stock restrictive exhaust system.
Sneak an Isky CL Kit in ASAP after engine installation.
What I found today searching for Factory HP & Torque ratings on the 1968- 1984 Tall Deck BBC Truck engines.
I think mine is 1984 Vintage................
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Old 08-29-2007, 11:14:35 PM #1
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
GM 427 Information
Hi Guys,
I have a bone stock 427CI GM Tall Deck Big block that I'm installing in a 1979 Chev 1/2ton 4X4(Replacing the 350 CI). The Casting Number on the block is 473478 I'm wondering what the Stock Horsepower and Torque ratings are for the these Tall Deck Truck engines. I can't seem to find any information anywhere else. Any help or pointers in the right direction would be Greatly Appreciated.
Thanks in Advance.
Bri69
Last edited by Bri69 : 08-29-2007 at 11:17:02 PM.
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Old 08-30-2007, 02:44:41 AM #2
rustbucket79
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Join Date: May 2003
Location: British Columbia, Canada
Posts: 9,076
HP is going to be low since they aren't intended to spin a bunch of RPM, they have low compression ratio, mild cam timing, and very small valves. The torque increase will be substantial over your 350.
__________________
Vids of the car: http://www.youtube.com/watch?v=Fb39m4ToP50
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Old 08-30-2007, 12:21:29 PM #3
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
Thanks rustbucket79. I used to drive the 5 ton truck that the 427 was originally in . it was in a 1962 GMC 5 Ton CabOver. It had very little problem turning 6000 RPM between gears..(the governor was seized up) LOL My intention for this finished truck is for truck pulling, snowplowing and playing with.
Take Care,
Brian Payne
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Old 08-30-2007, 12:32:30 PM #4
80'427
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Location: Fairbury, NE, USA
Posts: 1,886
It will accept a stroker crank and a .125 over bore for big power.
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Old 08-30-2007, 10:09:35 PM #5
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
Thanks for the tips. Though I'm not up to the point where I can afford to Do much of anything to this engine just yet. I'd just like to see how the rest of the driveline takes to the bigger engine. I attached it to the standard Muncie tranny through a 12" Centerforce Dual Friction clutch /pressure plate. They told me it would hold up to what ever I can put it through. (Evil laugh) we will see if what they say is true.
Thanks again.
Take Care,
Brian Payne
Daily Driver 2001 GMC Sierra 4.8L V8 / 4 speed automatic. Eats Rear tires, Catalitic Converters and Transmissions for breakfast. LOL
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Old 08-31-2007, 12:04:49 PM #6
rustbucket79
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Join Date: May 2003
Location: British Columbia, Canada
Posts: 9,076
Brian, it makes my colon tighten up to think of those brick like pistons sliding up and down at 6K. I guess we know just how bulletproof the truck rods really are. (I est. the same stress as that same rod with a passenger car weighted piston in a 427 turning 8000 rpm)
Clutch life has more to do with the initial load it sees than the actual power of the engine. We've had dipshyte customers take those clutches and roast them in a weekends abuse on the drag strip with slicks and 6000 clutch dumps. If you have a steep first gear and reasonable gearing for your tire size, that clutch will take a bunch of abuse. Put a set of 35's coupled with 3.08 gears and a bunch of torque and a heavy truck and clutch life will be greatly reduced.
Good luck and have fun!
__________________
Vids of the car: http://www.youtube.com/watch?v=Fb39m4ToP50
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Old 09-01-2007, 01:54:13 AM #7
Bri69
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Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
Now that you say it it does sound kind of scary turning that 427 at 6000RPM. It was always working underload when doing this (I'd never let it just sit and rev the snot out of it. Dad would have killed me..LOL)
As for the drive line in the 1979 4X4 it has a Muncie SM465 6.54:1 low gear 3.57:1 second gear. New Process 205 Transfer case 1.96:1 reduction ratio in low, and 1:1 in high range., 3.08 Differentials front has Racing spool rear has factory limited slip locker. and 33 X 12.5 -15 mud terrain tires.
It ran a long time with the 350CI I tried truck pulling, mud bogs, swamp swimming (On/off road rally) , playing in deep snowy fields, even tried teaching a cocky mustang driver not to underestimate an older truck. He sailed by me when I missed the shift to third. LOL
Take Care.
Last edited by Bri69 : 09-01-2007 at 02:02:13 AM.
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Old 09-02-2007, 04:43:14 PM #8
pdq67
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Join Date: Jul 2001
Location: Columbia, MO, USA
Posts: 10,498
Thumbs up
You can do a couple a things w/ it, imho!
First, buy a set of 427 car pistons in the overbore and compression ratio you want using whatever cc heads and .020" thick, stock type steel shim headgaskets and a set of .400" longer BB rods, balance her and it will rpm fine w/ whatever the rest of the combination turns out!!
(And don't forget that a .100" overbore 427 is a 447" engine and one bored an 1/8" over is a 452.2" engine!!)..............
OR...
Make a 496 out of her by using the needed 1/4" longer stroked crank and longer rod/piston combination to again make what you want.
It's no-brainer to me about the long rod 496!!
pdq67
PS., hunt up Speed-O-Motive and look through their BB rotating assembly stroker combinations!!!
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Old 09-08-2007, 12:12:24 AM #9
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
I found some Stock Numbers for the 427 truck block. 260HP @ 4000 RPM and 405 FT/Lbs torque at 2600 RPM.. Both Numbers are almost double what the 350CI was producing.
The numbers seem ok for what I had in mind for it. Ive run into some trouble placing Accessories on the front of the big block. Obviously the small block mounting brackets don't fit. If anybody has any pictures of a big block with the accessories attached ( powersteering, alt. waterpump. I have a 454 waterpump and harmonic balancer installed. got some 454 Powersteering brackets for it but not totaly sure how they fit on the motor. the altenator bracket doesn't want to fit my block for some reason. any picts of these parts installed would be appreciated. HEll I went to get new rocker gaskets and the damn stock bolts wern't long enough to go through the gasket.. I had to go buy ones that were 1 inch long. Thanks in advance..
Brian P.
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Old 09-08-2007, 12:24:15 AM #10
80'427
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Location: Fairbury, NE, USA
Posts: 1,886
you need to swap to a 396/427 balancer the 454 is external balanced.
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I am still thing of this 427 Tall Deck BBC for use in the 1963 Pontiac Grand Prix.
Running as is without Stroking to a 496 ci.
In stock form It has comparable HP & Torque to a run of the mill 1971-76 Pontiac 455.
Actually a hair more.
Run on piss water 87 octane gas as is. Definition of True daily driver affordability of driving 50 to 500 miles any time any where.
Factory HP & Torque was done with a Governed Holley Carb of maybe 450 cfm rating & crap stock restrictive exhaust system.
Sneak an Isky CL Kit in ASAP after engine installation.
What I found today searching for Factory HP & Torque ratings on the 1968- 1984 Tall Deck BBC Truck engines.
I think mine is 1984 Vintage................
Go Back NastyZ28.com > Drivetrain & Performance > Engine Topic
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Old 08-29-2007, 11:14:35 PM #1
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
GM 427 Information
Hi Guys,
I have a bone stock 427CI GM Tall Deck Big block that I'm installing in a 1979 Chev 1/2ton 4X4(Replacing the 350 CI). The Casting Number on the block is 473478 I'm wondering what the Stock Horsepower and Torque ratings are for the these Tall Deck Truck engines. I can't seem to find any information anywhere else. Any help or pointers in the right direction would be Greatly Appreciated.
Thanks in Advance.
Bri69
Last edited by Bri69 : 08-29-2007 at 11:17:02 PM.
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Old 08-30-2007, 02:44:41 AM #2
rustbucket79
Veteran Member
Join Date: May 2003
Location: British Columbia, Canada
Posts: 9,076
HP is going to be low since they aren't intended to spin a bunch of RPM, they have low compression ratio, mild cam timing, and very small valves. The torque increase will be substantial over your 350.
__________________
Vids of the car: http://www.youtube.com/watch?v=Fb39m4ToP50
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Old 08-30-2007, 12:21:29 PM #3
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
Thanks rustbucket79. I used to drive the 5 ton truck that the 427 was originally in . it was in a 1962 GMC 5 Ton CabOver. It had very little problem turning 6000 RPM between gears..(the governor was seized up) LOL My intention for this finished truck is for truck pulling, snowplowing and playing with.
Take Care,
Brian Payne
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Old 08-30-2007, 12:32:30 PM #4
80'427
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Join Date: Jan 2005
Location: Fairbury, NE, USA
Posts: 1,886
It will accept a stroker crank and a .125 over bore for big power.
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Old 08-30-2007, 10:09:35 PM #5
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
Thanks for the tips. Though I'm not up to the point where I can afford to Do much of anything to this engine just yet. I'd just like to see how the rest of the driveline takes to the bigger engine. I attached it to the standard Muncie tranny through a 12" Centerforce Dual Friction clutch /pressure plate. They told me it would hold up to what ever I can put it through. (Evil laugh) we will see if what they say is true.
Thanks again.
Take Care,
Brian Payne
Daily Driver 2001 GMC Sierra 4.8L V8 / 4 speed automatic. Eats Rear tires, Catalitic Converters and Transmissions for breakfast. LOL
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Old 08-31-2007, 12:04:49 PM #6
rustbucket79
Veteran Member
Join Date: May 2003
Location: British Columbia, Canada
Posts: 9,076
Brian, it makes my colon tighten up to think of those brick like pistons sliding up and down at 6K. I guess we know just how bulletproof the truck rods really are. (I est. the same stress as that same rod with a passenger car weighted piston in a 427 turning 8000 rpm)
Clutch life has more to do with the initial load it sees than the actual power of the engine. We've had dipshyte customers take those clutches and roast them in a weekends abuse on the drag strip with slicks and 6000 clutch dumps. If you have a steep first gear and reasonable gearing for your tire size, that clutch will take a bunch of abuse. Put a set of 35's coupled with 3.08 gears and a bunch of torque and a heavy truck and clutch life will be greatly reduced.
Good luck and have fun!
__________________
Vids of the car: http://www.youtube.com/watch?v=Fb39m4ToP50
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Old 09-01-2007, 01:54:13 AM #7
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
Now that you say it it does sound kind of scary turning that 427 at 6000RPM. It was always working underload when doing this (I'd never let it just sit and rev the snot out of it. Dad would have killed me..LOL)
As for the drive line in the 1979 4X4 it has a Muncie SM465 6.54:1 low gear 3.57:1 second gear. New Process 205 Transfer case 1.96:1 reduction ratio in low, and 1:1 in high range., 3.08 Differentials front has Racing spool rear has factory limited slip locker. and 33 X 12.5 -15 mud terrain tires.
It ran a long time with the 350CI I tried truck pulling, mud bogs, swamp swimming (On/off road rally) , playing in deep snowy fields, even tried teaching a cocky mustang driver not to underestimate an older truck. He sailed by me when I missed the shift to third. LOL
Take Care.
Last edited by Bri69 : 09-01-2007 at 02:02:13 AM.
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Old 09-02-2007, 04:43:14 PM #8
pdq67
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Join Date: Jul 2001
Location: Columbia, MO, USA
Posts: 10,498
Thumbs up
You can do a couple a things w/ it, imho!
First, buy a set of 427 car pistons in the overbore and compression ratio you want using whatever cc heads and .020" thick, stock type steel shim headgaskets and a set of .400" longer BB rods, balance her and it will rpm fine w/ whatever the rest of the combination turns out!!
(And don't forget that a .100" overbore 427 is a 447" engine and one bored an 1/8" over is a 452.2" engine!!)..............
OR...
Make a 496 out of her by using the needed 1/4" longer stroked crank and longer rod/piston combination to again make what you want.
It's no-brainer to me about the long rod 496!!
pdq67
PS., hunt up Speed-O-Motive and look through their BB rotating assembly stroker combinations!!!
pdq67 is offline Reply With Quote
Old 09-08-2007, 12:12:24 AM #9
Bri69
New Member
Join Date: Aug 2007
Location: Warsaw Ontario Canada
Posts: 6
I found some Stock Numbers for the 427 truck block. 260HP @ 4000 RPM and 405 FT/Lbs torque at 2600 RPM.. Both Numbers are almost double what the 350CI was producing.
The numbers seem ok for what I had in mind for it. Ive run into some trouble placing Accessories on the front of the big block. Obviously the small block mounting brackets don't fit. If anybody has any pictures of a big block with the accessories attached ( powersteering, alt. waterpump. I have a 454 waterpump and harmonic balancer installed. got some 454 Powersteering brackets for it but not totaly sure how they fit on the motor. the altenator bracket doesn't want to fit my block for some reason. any picts of these parts installed would be appreciated. HEll I went to get new rocker gaskets and the damn stock bolts wern't long enough to go through the gasket.. I had to go buy ones that were 1 inch long. Thanks in advance..
Brian P.
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Old 09-08-2007, 12:24:15 AM #10
80'427
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Join Date: Jan 2005
Location: Fairbury, NE, USA
Posts: 1,886
you need to swap to a 396/427 balancer the 454 is external balanced.
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8
87vette81big
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Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
I found MOROSO Solid Motor Mounts to work.
I also think I can fabricate my own Chevrolet Block to Pontiac Turbo 400 Trans Adapter plate.
I found MOROSO Solid Motor Mounts to work.
I also think I can fabricate my own Chevrolet Block to Pontiac Turbo 400 Trans Adapter plate.
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
I did some more research on my own Grumpy.
It looks like I have Oval Port BBC Heads already.
And the 427 Truck Tall Deck engines from 1976-84 all used Sodium Filled Exhaust Valves.
Looks like No One has ever come across An Unused 427 Tall Deck BBC Shortblock as I have.
GM Goodwrench .030" over 427 that is now 433 ci .
I did some more research on my own Grumpy.
It looks like I have Oval Port BBC Heads already.
And the 427 Truck Tall Deck engines from 1976-84 all used Sodium Filled Exhaust Valves.
Looks like No One has ever come across An Unused 427 Tall Deck BBC Shortblock as I have.
GM Goodwrench .030" over 427 that is now 433 ci .
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
There is a Report on another Forum I found Grumpy where a guy took one of these 427 Tall Deck BBC & Dropped it into his 1957 Chevy 2-dr.
3.00:1 Rear ( Ford 9") & he was able to smoke the rear tires easy at 50 MPH at Will.
Also Tall Deck BBC Was built to run 90-100% Wot All the time Full Load.
Maybe its not such a Boat anchor as all say it is.
I found your Posts too on Chevy Talk also Grumpy.
There is a Report on another Forum I found Grumpy where a guy took one of these 427 Tall Deck BBC & Dropped it into his 1957 Chevy 2-dr.
3.00:1 Rear ( Ford 9") & he was able to smoke the rear tires easy at 50 MPH at Will.
Also Tall Deck BBC Was built to run 90-100% Wot All the time Full Load.
Maybe its not such a Boat anchor as all say it is.
I found your Posts too on Chevy Talk also Grumpy.
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
Is it worth Messing with Grumpy this 427 Tall Deck using what's there ??
No $$$ to build a Stroker 496-555 ci monster.
Or stick with my 1965 Olds 425A engine ?
Comes down to basic $$. What will deliver more Torque & HP as is on pee water pump gas.
87 octane preferred.
Economy wont get better for a long time.
Bam Bam hasn't died still.
Is it worth Messing with Grumpy this 427 Tall Deck using what's there ??
No $$$ to build a Stroker 496-555 ci monster.
Or stick with my 1965 Olds 425A engine ?
Comes down to basic $$. What will deliver more Torque & HP as is on pee water pump gas.
87 octane preferred.
Economy wont get better for a long time.
Bam Bam hasn't died still.
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
If I was going to use that big block engine as a start point, Id probably take it apart and install the lower cost stroker kit, and a mild hydraulic cam simply because Ive done it several times and know youll be happy with the results, yes the stock engine will produce decent power but its not going to be in the same power class as the stroker kit equipped combo, especially with a decent aluminum intake and headers.( the stroker kit and mild cam, a bit of port and bowl clean-up is easily worth 80-100 plus hp)
Id try for 9:1-9.5:1 static compression and select a cam with a 106-108 lsa with the minimal duration to allow a 8:1 dynamic compression and a good dual plane intake ,and try to stay under .540 lift, in this application
and yeah! thats one of many reasons why Im so stuck, on my BIG BLOCK engine swap on my vette!
and why I don,t just throw a nearly stock 454 I have sitting in the shop now in the engine bay, Ive build and driven the 489-540BBC engine versions of that swap several times now, and theres just no comparison
I learned long ago you EITHER do things correctly the first time or you REGRET IT LATER
If I had any spare cash, I,d grab that differential and try and talk you into selling me that tall deck, just so I COULD REBUILD IT AND STICK IT IN MY VETTE, AND DEMONSTRATE ITS POTENTIAL WITH A STROKER KIT INSTALLED AND SOME PORT WORK ON THOSE HEADS,TOO YOU,!
but supporting my older sons family, my self and my mother-in-law is killing my finances currently
http://www.jegs.com/i/Scat/942/1-91505B ... Id=2794004
http://www.cranecams.com/product/cart.p ... il&p=23998
viewtopic.php?f=69&t=5123
If I was going to use that big block engine as a start point, Id probably take it apart and install the lower cost stroker kit, and a mild hydraulic cam simply because Ive done it several times and know youll be happy with the results, yes the stock engine will produce decent power but its not going to be in the same power class as the stroker kit equipped combo, especially with a decent aluminum intake and headers.( the stroker kit and mild cam, a bit of port and bowl clean-up is easily worth 80-100 plus hp)
Id try for 9:1-9.5:1 static compression and select a cam with a 106-108 lsa with the minimal duration to allow a 8:1 dynamic compression and a good dual plane intake ,and try to stay under .540 lift, in this application
and yeah! thats one of many reasons why Im so stuck, on my BIG BLOCK engine swap on my vette!
and why I don,t just throw a nearly stock 454 I have sitting in the shop now in the engine bay, Ive build and driven the 489-540BBC engine versions of that swap several times now, and theres just no comparison
I learned long ago you EITHER do things correctly the first time or you REGRET IT LATER
If I had any spare cash, I,d grab that differential and try and talk you into selling me that tall deck, just so I COULD REBUILD IT AND STICK IT IN MY VETTE, AND DEMONSTRATE ITS POTENTIAL WITH A STROKER KIT INSTALLED AND SOME PORT WORK ON THOSE HEADS,TOO YOU,!
but supporting my older sons family, my self and my mother-in-law is killing my finances currently
http://www.jegs.com/i/Scat/942/1-91505B ... Id=2794004
http://www.cranecams.com/product/cart.p ... il&p=23998
viewtopic.php?f=69&t=5123
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
Allright Grumpy.
What your telling me is the 427 Tall Deck Big Block Chevy is no match for my 1965 Olds 425 A Engine stock for stock with just camshaft swaps and retunes alone.
Unless I go Stroker kit in the 427 Tall Deck & Invest $5k at least into it .
Olds 425 needs less than $500 bucks to complete.
Just $100 bucks shy of $500 now.
425 has 360 HP & 470 FT/LBS stock.
Allright Grumpy.
What your telling me is the 427 Tall Deck Big Block Chevy is no match for my 1965 Olds 425 A Engine stock for stock with just camshaft swaps and retunes alone.
Unless I go Stroker kit in the 427 Tall Deck & Invest $5k at least into it .
Olds 425 needs less than $500 bucks to complete.
Just $100 bucks shy of $500 now.
425 has 360 HP & 470 FT/LBS stock.
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
I doubt youll have more than $3K more invested in the 427/489 once its installed, but yeah! if your going low buck, and fullly realize that the 427 chevy stroked to 489 or 496 BBC while more expensive, will easily out perform the olds ,once its modified, then yes the olds might be the best choice in near stock condition.
I doubt youll have more than $3K more invested in the 427/489 once its installed, but yeah! if your going low buck, and fullly realize that the 427 chevy stroked to 489 or 496 BBC while more expensive, will easily out perform the olds ,once its modified, then yes the olds might be the best choice in near stock condition.
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
Your essentially reusing the 427 Tall deck block Grumpy.
And Maybe the heads.
Rest gets thrown away.
Left over stock parts impossible to sell in this crap economy.
Tall deck blocks on fleabay are not selling. No market with $.
My experience with Olds V8 is 403 & larger takes very little investment to perform.
Many testomonies that the 1965-67 Olds 425 runs great on 87 octane crap gas.
Including the seller I bought my 425 from.
Your essentially reusing the 427 Tall deck block Grumpy.
And Maybe the heads.
Rest gets thrown away.
Left over stock parts impossible to sell in this crap economy.
Tall deck blocks on fleabay are not selling. No market with $.
My experience with Olds V8 is 403 & larger takes very little investment to perform.
Many testomonies that the 1965-67 Olds 425 runs great on 87 octane crap gas.
Including the seller I bought my 425 from.
8
87vette81big
Guest
Re: 427 Tall Deck BBC Find 15 years Later after Long Term St
Unlike 99% of others Grumpy I think Reverse Engineer.
Start with the Rear Differential & Rear suspension.
Then Fuel System.
Transmission.
Build an engine to suite what you have or can afford.
Big Engine is worthless is rest of car us not up to Par.
Problem all Vette owners face.
More engine easily built than rest of car can handle without destroying IRS & chassis.
Unlike 99% of others Grumpy I think Reverse Engineer.
Start with the Rear Differential & Rear suspension.
Then Fuel System.
Transmission.
Build an engine to suite what you have or can afford.
Big Engine is worthless is rest of car us not up to Par.
Problem all Vette owners face.
More engine easily built than rest of car can handle without destroying IRS & chassis.