mid range 383 sbc build

grumpyvette

grumpyvette

Administrator
Staff member
ENGINE
-383 stroker 442hp/470ft lbs of torque )
-Chevy 350 bored 30 over and stroked to 383ci
-Scat crank 3.75 Stroke Cast 9000 series
-Scat 5.7 forged I beam rods with 7/16 arp cap screws
-Forged Flat top Probe Sportsman Race Series Pistons
-Comp Cams Roller Cam Duration-Intake 230deg Exhaust 236deg @ .050 / Lift Int .510 Exh .520 and 110 lobe separation
-Air Flow Research 195cc Heads 74cc chambers
-9.7:1 compression
-Headman Block Hugger Headers -Edelbrock Fuel Pump
-Speed Demon 750cfm Carb Vacume secondaries
-Polished Air gap Intake
-Edelbrock aluminium water pump
-MSD Plug Wires
-All Bolts Are ARP
-Mini Starter
-Edelbrock double roller timing set
-Comp cams roller lifters
-Crane cams roller rockers
-Full Mandrel bent Flowmaster American Thunder exhaust With 50 series deltaflow mufflers

and dyno sheet...

Intake cener line 105 1/2
jets 76 front 85 rear
vac sec spring short yellow
timing 35 deg
RPM----HP----TQ----A/F--- Vol Eff%

3900 - 328 - 442 - 13.3 - 97
4000 - 340 - 447 - 14.0 - 97
4100 - 356 - 456 - 14.2 - 97.3
4200 - 370 - 462 - 14.0 - 97.5
4300 - 381 - 465 - 13.9 - 97.5
4400 - 390 - 465 - 13.9 - 97.4
4500 - 397 - 463 - 13.8 - 97.4
4600 - 404 - 461 - 13.7 - 97.2
4700 - 410 - 458 - 13.8 - 97.1
4800 - 416 - 465 - 13.8 - 96.9
4900 - 422 - 452 - 13.8 - 96.7
5000 - 427 - 448 - 13.8 - 96.3
5100 - 430 - 443 - 13.8 - 95.8
5200 - 433 - 437 - 13.9 - 95.2
5300 - 435 - 431 - 13.9 - 94.9
5400 - 436 - 424 - 13.8 - 94.6
5500 - 437 - 418 - 13.9 - 94.3
5600 - 439 - 411 - 14.0 - 94.0
5700 - 440 - 406 - 13.9 - 93.5
5800 - 442 - 400 - 13.9 - 92.8
5900 - 442 - 393 - 14.0 - 92.1
6000 - 440 - 385 - 14.0 - 91.5"
 
the stock production block is not nearly as strong as the better aftermarket blocks, and in a 9 second car Id suggest getting a DART splayed bolt block, the stock production block is rated for use at up to about 350-450 hp,
thats fine but chevy rates those, and current production, 4 bolt blocks as good for 350hp

http://www.sallee-chevrolet.com/ChevyBa ... 05123.html

http://www.sallee-chevrolet.com/ChevyBa ... 66034.html

even the chevy strait 4 bolt bowtie blocks only rated at 450hp

http://www.sallee-chevrolet.com/ChevyBa ... 85047.html
you get ahold of one of these bad boys, theres no worries of block cracking or grenading at 500+hp.
we all know guys who have built engines exceeding 450hp with stock blocks but the blocks not designed for that stress and the main caps tend to walk at 450 plus, yes you may get away for years before something fails, but the blocks not nearly as strong as a BOWTIE,DART,BRODIX etc designed for racing, keep in mind an engine that makes 450 peak hp is making much less at lower rpms, any engine held at max rpms will far more quickly show its flaws than one thats only occasionally run hard, thats why the dyno hero gets to show the proof his engine peaks at 450 plus hp, and still gets to drive the car on the street for months or even years, its very seldom run at full stress levels


you need to get into the splayed 4 bolt main cap blocks before the hp rating exceeds 450hp-500hp,


and your looking to sharply exceed that.
theres an excellent chance the main caps will be squirming around on a stock block at those hp levels and thats not good for durribility.
http://www.dartheads.com/products/block ... locks.html

standard two bolt production block (below)
10051181b2.jpg

standard production 4 bolt block(below)
10185047b.jpg


splayed bolt 4 bolt main cap block (below)
DARTSHPBLOCK004.jpg
 
grumpyvette said:
ENGINE
-383 stroker 442hp/470ft lbs of torque )
-Chevy 350 bored 30 over and stroked to 383ci
-Scat crank 3.75 Stroke Cast 9000 series
-Scat 5.7 forged I beam rods with 7/16 arp cap screws
-Forged Flat top Probe Sportsman Race Series Pistons
-Comp Cams Roller Cam Duration-Intake 230deg Exhaust 236deg @ .050 / Lift Int .510 Exh .520 and 110 lobe separation
-Air Flow Research 195cc Heads 74cc chambers
-9.7:1 compression
-Headman Block Hugger Headers -Edelbrock Fuel Pump
-Speed Demon 750cfm Carb Vacume secondaries
-Polished Air gap Intake
-Edelbrock aluminium water pump
-MSD Plug Wires
-All Bolts Are ARP
-Mini Starter
-Edelbrock double roller timing set
-Comp cams roller lifters
-Crane cams roller rockers
-Full Mandrel bent Flowmaster American Thunder exhaust With 50 series deltaflow mufflers

and dyno sheet...

Intake cener line 105 1/2
jets 76 front 85 rear
vac sec spring short yellow
timing 35 deg
RPM----HP----TQ----A/F--- Vol Eff%

3900 - 328 - 442 - 13.3 - 97
4000 - 340 - 447 - 14.0 - 97
4100 - 356 - 456 - 14.2 - 97.3
4200 - 370 - 462 - 14.0 - 97.5
4300 - 381 - 465 - 13.9 - 97.5
4400 - 390 - 465 - 13.9 - 97.4
4500 - 397 - 463 - 13.8 - 97.4
4600 - 404 - 461 - 13.7 - 97.2
4700 - 410 - 458 - 13.8 - 97.1
4800 - 416 - 465 - 13.8 - 96.9
4900 - 422 - 452 - 13.8 - 96.7
5000 - 427 - 448 - 13.8 - 96.3
5100 - 430 - 443 - 13.8 - 95.8
5200 - 433 - 437 - 13.9 - 95.2
5300 - 435 - 431 - 13.9 - 94.9
5400 - 436 - 424 - 13.8 - 94.6
5500 - 437 - 418 - 13.9 - 94.3
5600 - 439 - 411 - 14.0 - 94.0
5700 - 440 - 406 - 13.9 - 93.5
5800 - 442 - 400 - 13.9 - 92.8
5900 - 442 - 393 - 14.0 - 92.1
6000 - 440 - 385 - 14.0 - 91.5"
Click to expand...



Hey Grumpy that combo looks real familiar....lol

Any one with thoughts for improvements, tuning or parts?
 
youve got a very well thought thru combo now, for a street /strip car thats driven on the street most of the time..
tell me more about your drive train and exhaust,and where you want improved power,
Id need to know the
transmission,used
(stall speed if its an auto),
rear gear ratio
tire dia,
exhaust pipe size

but its a reasonable guess that the
Headman Block Hugger Headers are not ideal,and that full lenght headers might help.
and the exhaust flow rates (assuming its currently a true dual 2.5" system without an (H) or (X) pipe ) ( IM assuming its not already a 3" system with a (H) or (X) pipe ,because of the block hugger headers tend to be matched to a 2.5" exhaust that could be improved )and a SLIGHT increase in cam durration and lift might help PEAK hp, but its also likely to reduce some of the low rpm tq.
 
Chevy 350 bored 30 over and stroked to 383ci, 4 bolt with ARP studs and billet main caps
-Forged crank 3.75
-6" forged H beam rods with 7/16 arp cap screws
-Forged Flat top (Probe I believe) .005 in the hole
-Comp Cams XE Solid flat tappet Cam Duration-Intake 252deg Exhaust 260deg @ .050 / Lift Int .540 Exh .558 and 110 lobe separation .012 lash
-Air Flow Research 210cc Heads 68cc chambers, these are the older AFR haeds from about 4 years ago.
-10.3:1 compression
-Hooker Super Comp 1 3/4" Pri. 3" collector fenderwell Headers
-Edelbrock Fuel Pump
-Mighty Demon 830cfm Carb
-Edelbrock Super Victor w/ 1" spacer
-Edelbrock water pump
-MSD Plug Wires 8.8 mm Super conductor
-All Bolts Are ARP
-Mini Starter
-Pete Jackson gear drive
-Comp cams solid lifters
-Comp cams Pro Magnum roller rockers 7/16 stud
-Full Mandrel bent 3" older 40 series 2 chamber Flow Masters 3" in and out

This is my combo, let me knwo what you think?

Phil
 
grumpyvette said:
youve got a very well thought thru combo now, for a stret strip car driven on the street most of the time..
tell me more about your drive train and exhaust,and where you want improved power,
Id need to know the
transmission,used
(stall speed if its an auto),
rear gear ratio
tire dia,
exhaust pipe size

but its a reasonable guess that the
Headman Block Hugger Headers are not ideal,and that full lenght headers might help.
and the exhaust flow rates (assuming its currently a true dual 2.5" system without an (H) or (X) pipe ) ( IM assuming its not already a 3" system with a (H) or (X) pipe ,because of the block hugger headers tend to be matched to a 2.5" exhaust that could be improved )and a SLIGHT increase in cam durration and lift might help PEAK hp, but its also likely to reduce some of the low rpm tq.
Click to expand...


The car is a 4000lb impala with the motor above with a 700r4, 2200-2500ish large diameter converter, run to a ford 9 inch with 3.89 gears with a 255/35/20 tire that I think is 27 inches tall. The exhaust is a 2 1/2 mandrel bent flowmaster kit with 50 series mufflers. I went with the block huggers due to ground clearance as the long tubes for the X frame chevy's hang quite low. Due to the X frame there is no room for an X or H pipe unless I run a pipe like the stock cross over pipe that single exhaust cars have.
 
I didn't mean to thread crap. I went in and tried to delete my post to make a separate one, but there is no delete option. I was just trying to get opinions on my combo as well. :D
 
HYPURR DBL NKL said:
I didn't mean to thread crap. I went in and tried to delete my post to make a separate one, but there is no delete option. I was just trying to get opinions on my combo as well. :D
Click to expand...

No worries! I am fairly new to this but it seems to me like a good setup for a strip car with a loose converter.
 
Still building the car, but yeah I plan on running a 3,500 stall to start with. It's got a built 12 bolt with 4.10 gears, and a 400 tranny full manual reverse pattern. Plan on running Cal tracs with it as well. I'm hoping for 11.80's or quicker.

Phil
 
HYPURR DBL NKL said:
Chevy 350 bored 30 over and stroked to 383ci, 4 bolt with ARP studs and billet main caps
-Forged crank 3.75
-6" forged H beam rods with 7/16 arp cap screws
-Forged Flat top (Probe I believe) .005 in the hole
-Comp Cams XE Solid flat tappet Cam Duration-Intake 252deg Exhaust 260deg @ .050 / Lift Int .540 Exh .558 and 110 lobe separation .012 lash
-Air Flow Research 210cc Heads 68cc chambers, these are the older AFR haeds from about 4 years ago.
-10.3:1 compression
-Hooker Super Comp 1 3/4" Pri. 3" collector fenderwell Headers
-Edelbrock Fuel Pump
-Mighty Demon 830cfm Carb
-Edelbrock Super Victor w/ 1" spacer
-Edelbrock water pump
-MSD Plug Wires 8.8 mm Super conductor
-All Bolts Are ARP
-Mini Starter
-Pete Jackson gear drive
-Comp cams solid lifters
-Comp cams Pro Magnum roller rockers 7/16 stud
-Full Mandrel bent 3" older 40 series 2 chamber Flow Masters 3" in and out

This is my combo, let me knwo what you think?

Phil
Click to expand...

it would help to know what car its INSTALLED IN? and the car weight and drive train details
HYPURR DBL NKL said:
"Still building the car, but yeah I plan on running a 3,500 stall to start with. It's got a built 12 bolt with 4.10 gears, and a 400 tranny full manual reverse pattern. Plan on running Cal tracs with it as well. I'm hoping for 11.80's or quicker. "
Phil
Click to expand...
yes that HELPS A GREAT DEAL, BUT the car weight an tire dia. would be helpfull
 
It's a '55 Del Ray two door post. Intended tire dia. will be 28". Not sure what she'll scale at? She's pretty gutted right now, I'm guessing 3,300 with me in it, hopefully. Hope this helps you out? Any more info needed, let me know.

Phil
 
looking over the combo and playing with it with my software makes me think the cams got a bit more duration than ideal for the combo, as it looks like your power curve is mostly in the upper part of the rpm band.
switching to slightly milder cam like a 114681 crane would cost you very little in high rpm power but boost the mid rpm tq noticably, youll probably find peak hp drops very slightly but the car should be marginally quicker.

BTW IF youve installed 1.6:1 ratio rockers and the pushrods rub...in the guide slots in the cylinder heads,
this is a common problem,easily solved...
YOU NEED A louis tool, YOU WANT ABOUT .060 CLEARANCE, IT MAKES THE JOB EASY
This tool was designed to simplify the modification needed when using 1.6 rocker arms on SB-Chevy heads. It allows you to use a hand drill with a 5/16'' bit to elongate the pushrod slot exactly in line with the existing slot, thus eliminating the need for guide plates.
stampedcvrockersa.jpg

stock stamped rockers are cheap but the ratio is usually not precise and the slots for the rocker studs can bind at high lift plus they easily restrict 10-15 hp in friction losses.
rollerr1.jpg

rollerr3.jpg

roller tips are usually more precise ratio rockers but don,t look for any huge reduction in friction

rollerr2.jpg

true roller rockers can frequently free up 15-20 hp in reduced friction.
viewtopic.php?f=50&t=1249&p=3409&hilit=stroker#p3409
 
plot your engines power curve, and remember you want to spend the vast majority of your time between your torque peak and your hp peaks, and remember most auto transmission tend to shift at a lower rpm than that current cams designed to produce peak power at.

http://www.geocities.com/z_design_studi ... zx_tt.html

your rear gear is 4.11:1

your th400 trans gears are
2.48
1.48
1.0


your tire dia. is 28.0"

look at the rpms your likely turning in each gear

much more info

viewtopic.php?f=71&t=555

http://www.datsuns.com/Tech/whentoshift.htm

viewtopic.php?f=44&t=1010&p=1829#p1829
 
61ragtop said:
grumpyvette said:
youve got a very well thought thru combo now, for a stret strip car driven on the street most of the time..
tell me more about your drive train and exhaust,and where you want improved power,
Id need to know the
transmission,used
(stall speed if its an auto),
rear gear ratio
tire dia,
exhaust pipe size

but its a reasonable guess that the
Headman Block Hugger Headers are not ideal,and that full lenght headers might help.
and the exhaust flow rates (assuming its currently a true dual 2.5" system without an (H) or (X) pipe ) ( IM assuming its not already a 3" system with a (H) or (X) pipe ,because of the block hugger headers tend to be matched to a 2.5" exhaust that could be improved )and a SLIGHT increase in cam durration and lift might help PEAK hp, but its also likely to reduce some of the low rpm tq.
Click to expand...


The car is a 4000lb impala with the motor above with a 700r4, 2200-2500ish large diameter converter, run to a ford 9 inch with 3.89 gears with a 255/35/20 tire that I think is 27 inches tall. The exhaust is a 2 1/2 mandrel bent flowmaster kit with 50 series mufflers. I went with the block huggers due to ground clearance as the long tubes for the X frame chevy's hang quite low. Due to the X frame there is no room for an X or H pipe unless I run a pipe like the stock cross over pipe that single exhaust cars have.
Click to expand...



Hey Grumpy here is the info you asked for on the original combo. I think the post got over looked with the posts on the other combo.
 
your totally correct, thanks for catching that,that info got overlooked.and confused and mixed up, with both cars in that I was responding to the second posters (HYPURR DBL NKL) question on his combo, and used some of the info off your data, if thats confusing I truely apologize, it was not meant to be, but obviously I screwed up there, Ive changed that so its now relievant, to the th400
 
I appologize for muddying the post. I tried to delete my original post and start a new one, but couldn't fine the delete. By the time I found it Grumpy had already replied and it went from there.

Phil
 
HYPURR DBL NKL said:
I appologize for muddying the post. I tried to delete my original post and start a new one, but couldn't fine the delete. By the time I found it Grumpy had already replied and it went from there.

Phil
Click to expand...


No worries Phil we are all here to learn....
 
61ragtop said:
61ragtop said:
grumpyvette said:
youve got a very well thought thru combo now, for a stret strip car driven on the street most of the time..
tell me more about your drive train and exhaust,and where you want improved power,
Id need to know the
transmission,used
(stall speed if its an auto),
rear gear ratio
tire dia,
exhaust pipe size

but its a reasonable guess that the
Headman Block Hugger Headers are not ideal,and that full lenght headers might help.
and the exhaust flow rates (assuming its currently a true dual 2.5" system without an (H) or (X) pipe ) ( IM assuming its not already a 3" system with a (H) or (X) pipe ,because of the block hugger headers tend to be matched to a 2.5" exhaust that could be improved )and a SLIGHT increase in cam durration and lift might help PEAK hp, but its also likely to reduce some of the low rpm tq.
Click to expand...


The car is a 4000lb impala with the motor above with a 700r4, 2200-2500ish large diameter converter, run to a ford 9 inch with 3.89 gears with a 255/35/20 tire that I think is 27 inches tall. The exhaust is a 2 1/2 mandrel bent flowmaster kit with 50 series mufflers. I went with the block huggers due to ground clearance as the long tubes for the X frame chevy's hang quite low. Due to the X frame there is no room for an X or H pipe unless I run a pipe like the stock cross over pipe that single exhaust cars have.
Click to expand...



Hey Grumpy here is the info you asked for on the original combo. I think the post got over looked with the posts on the other combo.
Click to expand...



So any ideas on my original 383 motor that the post is about with this info on my setup?
 
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