some basic bbc math, to get you thinking about your potential dream bbc combos.

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
I recently had a discussion with one of the local guys concerning what heads and rotating assembly he should buy now that he recently purchased a tall deck (10.2") big block chevy block.
he has a perfectly good 427 forged crank (3.76" stroke) but hes seriously thinking of buying a (4.25" stroke) forged crank.
the DART blocks available have got a 4.6" bore.
ok simple math, displacement= bore diam. x bore diam. x 8(cylinders)x stroke x .7854
lets assume these are max effort race engines built with 13:1 compression requiring E85 or race octane fuel, and yeah if your going to use e85 Id suggest you slightly increase the intake port cross sectional area as you'll need more air flow for alcohol based fuel.
BBC cylinder head designs vary a great deal, so shop carefully
BBCbott.jpg

3.76" stroke x 4.6 bore = 500 inches of displacement
4.25" stroke x 4.6 bore = 565 cubic inches of displacement




9.8 Short deck
Aftermarket block

Bore. Stroke. Rod. Displacement
4.5. 4. 6.385/6.535. 509
4.5. 4.25. 6.135/6.535 540
4.5. 4.5. 6.135. 572
4.56. 4.25. 6.385 555
4.6. 4.25. 6.385. 565

Tall deck 10.2
4.5. 4.25. 6.535. 540
4.5. 4.5. 6.535. 572
4.5. 4.75. 6.7. 604
4.56. 4.25. 6.535. 555
4.6. 4.5. 6.535. 598

max piston speed should not exceed about 48,000 inches per minute and that requires high quality forged parts


3.76" stroke=6380 rpm redline

4.25" stroke- =5647 rpm redline

assuming either engine makes about 1.25 ft lbs of torque at close to peak rpm, lets say 500 rpm less
your looking at about 625 ft lbs on the 500 cubic inch engine.
close to 725 hp
it is likely your likely going to want heads with a 4.25 cross sectional area
Int. Duration is 276 degrees
Exh Duration is 290 degrees
LSA is 109 degrees

http://garage.grumpysperformance.co...onnecting-rod-rod-length-too-stroke-info.510/





your looking at about 706 ft lbs on the 565 cubic inch engine.
close to 737 hp is likely

it is likely your likely going to want heads with a 4.5 cross sectional area
Int. Duration is 286 degrees
Exh Duration is 303 degrees
LSA is 111 degrees

yes Im fully aware most people don,t bother to read the links and sub-links
UNTIL they have expensive parts fail.
but for the few people on the web site that might prefer spending less time and cash replacing expensive failed parts,
and financing the machine shop owners vacations and paying his mortgage... I post them anyway
what length connecting rod and what piston pin height are you using, building the 496 BBC?
yes Im assuming its a tall deck 10.2" block and a 4.25" stroke

a 4.25" stroke,6.8" rod and 1.270 pin height, for that 10.2 deck height block

6.8" rod divided by a 4.25" stroke=1.6 ratio

displacement = bore x bore x stroke x 8 x .7854

1/2 stroke + rod length+piston pin compression height,
should roughly equal block deck height ,



9.8 Short deck
Aftermarket block

Bore. Stroke. Rod. Displacement
4.5. 4. 6.385/6.535. 509
4.5. 4.25. 6.135/6.535 540
4.5. 4.5. 6.135. 572
4.56. 4.25. 6.385 555
4.6. 4.25. 6.385. 565

Tall deck 10.2
4.5. 4.25. 6.535. 540
4.5. 4.5. 6.535. 572
4.5. 4.75. 6.7. 604
4.56. 4.25. 6.535. 555
4.6. 4.5. 6.535. 598
plus or minus a few thousandths,
minor adjustments in compression,
due to head gasket thickness and what the piston deck height is are common
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

if you wonder why I suggest using SCAT (H) beam style cap screw connecting rods vs stock or most (I) beam designs this picture should show the increased cam to connecting rod clearance

After market performance ,big block connecting rods come in several common lengths
0704ch_15_z+chevy_big_blocka.jpg

6.7-6.8"

https://www.summitracing.com/parts/esp-67003dl19/overview/make/chevrolet

https://www.summitracing.com/parts/cpi-u16230/overview/make/chevrolet

https://www.summitracing.com/parts/sca-6670022a/overview/make/chevrolet

https://www.summitracing.com/parts/sca-6680022a/overview/make/chevrolet

https://www.summitracing.com/parts/sca-6680022/overview/make/chevrolet



0704ch_14_z+chevy_big_block+.jpg

notice the pin height in the pistons pictured above allow a longer or shorter connecting rod length
http://garage.grumpysperformance.co...-about-your-potential-dream-bbc-combos.14607/

http://garage.grumpysperformance.co...od-rod-length-too-stroke-info.510/#post-10311

http://garage.grumpysperformance.co...onnecting-rod-rod-length-too-stroke-info.510/

http://garage.grumpysperformance.com/index.php?threads/measuring-rod-and-pin-heights.3760/#post-9968




blueprint engine blocks
https://www.jegs.com/v/Blueprint-En...brand&storeId=10001&catalogId=10002&langId=-1

DART BLOCKS
http://dartheads.com/product-category/big-block-chevy/blocks/

world products blocks
https://www.billmitchellproducts.com/engine-blocks/

G.M. performance
https://www.gmperformancemotor.com/category/LS196.html

either engine will require a roller lifter cam with a fairly tight 109-111 lsa and about a .700 lift too breath to its potential, both engines would benefit from a tunnel ram intake and dual quads or a stack injection style intake



chkbr1.jpg

chkbr2.jpg

plas1v.jpg

plas2v.jpg


Catalog info on P bearings:

1638764486952.png

BEARv13.jpg


its the attention to details and checking clearance etc. and time and care taken,
that makes the difference between a barely or average functional ,
and a rather exceptional engine build, yes the urge to get it running is strong,
but getting it done correctly is the goal

yodam.jpg

your fpm is found by multiplying the engine rpms x the stroke x 2
example
on a 383 sbc the stroke is 3.75", so 4000fpm on a 383 is reached at 4000rpm x 12"(inches)= 48,000 inches per minute of piston travel
so 48,000/7.5" of stroke =6400rpm, (7.5" is twice the engines 3.75" stroke)
exceeding that is a reasonably sure way to over stress the engine or (get into valve control issues ( which is a different can of worms)
this is a good place to point out that ARP makes much stronger rod bolts and main cap studs,and that the better aftermarket forged 4340 forged connecting rods are far stronger than most OEM connecting rods and that a 7/16" arp rod bolt is on average 200%-250% stronger than a stock 3/8" OEM rod bolt.
balanced components tend to put significantly lower stress on the engine components
theres lots of guys that don,t comprehend the stress levels involved in spinning a longer stroke engine up over 7000 rpm,
as a result theres a lot of guys who as a result get an expensive personal education in that area,of engineering stress management ,
after their engine "EXPLODED FOR NO REASON" and 90% plus will blame the machine shop ,
not realizing or refusing to accept, its their own lack of grasping the concepts involved.
P12CHARTS.jpg


ideal port cross section

BBCstacksil.jpg

kinslert1.jpg


IVE talked to several engineers, all strongly suggested the vertical stack injection manifold pictured below will significantly out flow the horizontal stack version above
kinslert2.jpg



egcl1.png

egcl2.png




the first few rule's of GRUMPY'S engine assembly

(1) THINK THINGS THROUGH CAREFULLY ,
WRITE DOWN A LIST OF COMPONENTS ,

MAKE DARN SURE THE LIST IS COMPATIBLE WITH,
and AT LEAST SEMI-REASONABLY PRICED WITHIN YOUR BUDGET.
FOR WHAT YOU INTEND TO BUILD AND RESEARCH THE RELATED MACHINE WORK,

RESEARCH CAREFULLY THE COMPONENT INSTALLATION AND INTENDED USE ,
AND POWER BAND THE PARTS WILL REQUIRE

AND FIND AN EXPERIENCED MENTOR.

(2) if in doubt, about how to do anything, on an engine, do some detailed research,
find and compare at least 3-5 valid trust worthy sources info,
read the instructions over again, several time's very carefully
and if available watch several related videos.

(3) if any component will not easily function as designed or requires a good bit of physical force to install ,
or your not 100% sure your doing something CORRECTLY

STOP, FIND OUT EXACTLY HOW THE PARTS SUPPOSED TO FIT AND FUNCTION,& WHY! YOUR HAVING PROBLEMS
theres a reason, and you better verify your clearances are correct , and your following the instructions before you proceed.

(4) never assume the parts you purchased can be used without carefully , cleaning them prior too,
checking the physical condition, verifying clearances and using the correct sealant, lubricants etc.



(5) the quality of a component is generally at least loosely related to the cost to produce it,
and the amount of detailed research and quality machine work that went into its production.
if you got a significant reduced price, theres typically a reason.
it might simply be because a new improved part superseded the one you purchased,
but it might be a far lower quality imported clone with lower quality materials and machine work.
its the purchasers responsibility to research quality.

(6) if you did not do the work personally or at least take the effort to verify it was done correctly and personally verify clearances

ITS almost a sure thing that it was NOT done , correctly, and yes that mandates you fully understand what your looking at,
and how the components are supposed to function and have high quality precision measuring tools.

(7) ITS ALMOST ALWAYS FASTER AND LESS EXPENSIVE , AND PRODUCES BETTER RESULTS IF YOU,
BUY FEWER HIGH QUALITY PARTS & DO THINGS CORRECTLY THE FIRST TIME

ID suggest you select from heads from these sources
Jegs; 800/345-4545; Jegs.com

Summit Racing; 800/230-3030; SummitRacing.com

Scoggin-Dickey Parts Center; 800/456-0211; ScogginDickey.com


TRICKFLOW
http://www.trickflow.com/egnsearch.asp? ... 4294867081
http://www.trickflow.com/customerservice
1-330-630-1555 • 1-888-841-6556

BRODIX
http://www.brodix.com/heads/heads.html
479.394.1075

DART
http://www.dartheads.com/products/cylinder-heads
Dart Machinery; 248/362-1188; DartHeads.com


AIR FLOW RESEARCH
http://www.airflowresearch.com/
toll free: 877-892-8844
tel: 661-257-8124

Patriot Performance
Patriot Performance; 888/462-8276; Patriot-Performance.com


RHS
http://www.racingheadservice.com/rhs/cylinder-headshtml
Toll Free: 877-776-4323
Local: 901-259-1134

EDELBROCK
http://www.edelbrock.com/automotive_new ... main.shtml
Edelbrock; 310/781-2222; Edelbrock.com

BMP (world products)
http://www.theengineshop.com/products/cylinder-heads
Tel: 631-737-0372
Fax: 631-737-0467

BUTLER PERFORMANCE
http://www.butlerperformance.com/products/cylinder_heads/cylinder_head_labor.html
866-762-7527

BLUE PRINT ENGINES
http://www.blueprintengines.com/ind...sb-chevy-aluminum-cylinder-heads-cnc-machined
1800-483-4263

PRO-FILER
https://www.profilerperformance.com/
937‐846‐1333

before you buy components talk to both the vendors and your machine shop of choice , you damn sure don,t want mis-matched components and clearances.
you need to measure accurately, know what your current block will function correctly with and pay attention to clearances and other details that make or break the engines potential durability and power potential.

related info
http://garage.grumpysperformance.com/index.php?threads/calculating-ideal-port-size.624/#post-8692

http://garage.grumpysperformance.co...od-rod-length-too-stroke-info.510/#post-10311

http://garage.grumpysperformance.com/index.php?threads/redline.343/#post-15729

http://garage.grumpysperformance.com/index.php?threads/types-of-crankshaft-steel.204/

http://garage.grumpysperformance.com/index.php?threads/connecting-rod-strength-h-vs-i-beam.1168/


http://garage.grumpysperformance.com/index.php?threads/bits-of-427-bbc-build-related-info.15543/

http://garage.grumpysperformance.com/index.php?threads/427-tall-deck.15267/

http://garage.grumpysperformance.co...-the-oil-used-and-oil-level-does-mater.15592/

http://www.wallaceracing.com/cam-spec-calc.php

http://www.wallaceracing.com/header_length.php

http://www.wallaceracing.com/runnertorquecalc.php
 
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INFO from a basic phone conversation today......
and a response I said Id post


Grumpy I recently purchased a older motor home from a salvage yard at a decent price,
with a lower compression 454 BBC engine and a TH400 transmission at what I considered a decent price.
I know it runs as I had them start it up, and it runs smooth and does not smoke,
The oil level looked decent, no coolant in the oil,
but it was up on jack stands and had no drive shaft or radiator ,
so I could not do more than hear in run for 30 seconds or so.
I did so, based on the need for a basic engine in a planed hot rod project, I'll be using for mostly instructional purposes with my older son, whose now 17.
we have not quite decided on the car to install it in yet but a t-bucket seems like a good candidate,
as it allows rather easy component access, and I like the way RICKS, project has progressed.
any basic ideas here might be helpful?

if your looking for a local machine shop,
in the west palm beach fla area
be damn sure you get all the details in writing
dates prices, details on what needs to be done
delivery dates and take pictures
these guys generally do decent work




first choice (use them fairly often to rebuild heads)

Engine Rebuilders-Palm Beach,
1722 Donna Rd, West Palm Beach, FL 33409

second choice (mostly for block line hone & decking)

Keener's Engine Machine Inc
2517 N Military Trl, West Palm Beach, FL 33409



third choice
these guys get decent reviews but Ive only been there once)

170 Commerce Rd, Suite 1A
Boynton Beach Florida 33426
https://www.mprracingengines.com/
ok, first step, would be to determine the block and head casting numbers and the current physical condition of the engine,
and thinking through a realistic budget and time frame.
you need to know if its a gen IV,V,or V! BIG BLOCK,
in an older motor home its almost sure to be the basic mark IV 454 engine with a cast crank and oval port heads.
this is good as theres a wide selection of parts, but again you need to verify what you have and its current condition.
most of us work on very limited budgets, but unless you know what your starting with as a base you can,t make logical decisions.
obviously the car you select its weight and the condition of the TH400 transmission ,
if thats what you choose to use in your project must also be looked at and carefully inspected.
your budget, a place to work on the car of your choice and the tools and skills you have are also obviously important.
if you have a couple local car, or hot rodder clubs I would suggest looking into the car shows,
and clubs as the more contacts you have the easier it tends to be to find parts,
and gain help from people with skills you might not currently have.
yeah reading links will at first look intimidating and maybe boring ,
but youll be amazed at the info and knowledge ,
youll gain in the process and the questions you did not yet know too ask.
the basics remain consistent, you want the best flowing heads and intake you can afford,
some O.E.M. heads can be used with minor port work, some are rather restrictive,
and yeah we all work on limited budgets that dictate our choices at times,
at least 9.5:1 compression, a 7-8 quart baffled oil pan,
and a set of headers and low restriction exhaust,
a cam will be selected matching the application,
compression, drive train gearing and intended rpm range and power band.

bbcbooklh.jpg

TRICKFLOW
http://www.trickflow.com/egnsearch.asp? ... 4294867081
http://www.trickflow.com/customerservice
1-330-630-1555 • 1-888-841-6556

BRODIX
http://www.brodix.com/heads/heads.html
479.394.1075

DART
http://www.dartheads.com/products/cylinder-heads
Dart Machinery; 248/362-1188; DartHeads.com


AIR FLOW RESEARCH
http://www.airflowresearch.com/
toll free: 877-892-8844
tel: 661-257-8124

Patriot Performance
Patriot Performance; 888/462-8276; Patriot-Performance.com

TRJ
http://trjperformance.com/cylinder-heads-top-end-kits-components/complete-heads/

RHS
http://www.racingheadservice.com/rhs/cylinder-headshtml
Toll Free: 877-776-4323
Local: 901-259-1134

EDELBROCK
http://www.edelbrock.com/automotive_new ... main.shtml
Edelbrock; 310/781-2222; Edelbrock.com

BMP (world products)
http://www.theengineshop.com/products/cylinder-heads
Tel: 631-737-0372
Fax: 631-737-0467

BUTLER PERFORMANCE
http://www.butlerperformance.com/products/cylinder_heads/cylinder_head_labor.html
866-762-7527

BLUE PRINT ENGINES
http://www.blueprintengines.com/ind...sb-chevy-aluminum-cylinder-heads-cnc-machined
1800-483-4263

TRJ
http://trjperformance.com/cylinder-heads-top-end-kits-components/complete-heads/

PRO-FILER
https://www.profilerperformance.com/
937‐846‐1333

http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/page-5#post-79540

useful related info,
Youll rapidly learn that this website has a great deal to offer,
but its based on you asking questions and reading links and sub links.
yeah its the links and sub links that hold a great deal of info and tips

http://garage.grumpysperformance.com/index.php?forums/tbuckets-and-custom-kit-cars.109/

http://garage.grumpysperformance.com/index.php?threads/casting-numbers-vin.93/#post-9024

http://garage.grumpysperformance.co...nks-to-casting-numbers-and-info.632/#post-846

http://garage.grumpysperformance.co...ou-might-want-too-look-over.14682/#post-79254

http://garage.grumpysperformance.com/index.php?threads/sellecting-cylinder-heads.796/

http://garage.grumpysperformance.co...ur-very-basic-454-big-block-chevy-build.1211/

http://garage.grumpysperformance.com/index.php?threads/finding-a-machine-shop.321/#post-3007

http://garage.grumpysperformance.co...t-intake-on-oval-port-heads.13146/#post-69975

http://garage.grumpysperformance.com/index.php?threads/semi-fool-proof-cam-sellection.82/

http://garage.grumpysperformance.co...mbers-or-a-good-street-combo-your-after.5078/

http://garage.grumpysperformance.co...no-2000-camshaft-possibilities-for-396.15521/

http://garage.grumpysperformance.com/index.php?threads/big-block-head-comparison.319/

http://garage.grumpysperformance.com/index.php?threads/types-of-crankshaft-steel.204/

http://garage.grumpysperformance.co...n-chamber-big-block-heads-and-casting-s.3960/

http://garage.grumpysperformance.com/index.php?threads/big-block-pushrod-guide-plates.4596/

http://garage.grumpysperformance.co...g-and-installing-connecting-rods-pistons.247/

http://garage.grumpysperformance.co...at-would-you-build-for-that.11014/#post-48706

http://garage.grumpysperformance.co...-the-charts-calculators-and-basic-math.10705/

http://garage.grumpysperformance.co...ng-combustion-chambers.2630/page-3#post-77963

http://garage.grumpysperformance.com/index.php?threads/finding-matched-valve-spring-required.13774/

http://garage.grumpysperformance.co...uild-the-engine-to-match-the-cam-specs.11764/
 
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http://garage.grumpysperformance.com/index.php?threads/measuring-port-length.15763/

http://www.wallaceracing.com/piston-speed-velocity.php

http://garage.grumpysperformance.com/index.php?threads/calculating-header-design.185/

http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

http://garage.grumpysperformance.com/index.php?threads/header-dimension-calculator.15013/

http://www.wallaceracing.com/runnertorquecalc.php

http://www.wallaceracing.com/intake-runner-length.php

http://www.bgsoflex.com/intakeln.html

https://www.rbracing-rsr.com/runnertorquecalc.html

http://racehead.com.au/designing-performance/what-size-itb-should-i-use/

http://garage.grumpysperformance.com/index.php?threads/header-dimension-calculator.15013/

http://maxracesoftwares.com/softwareproducts.htm
volumetric.gif

Varying-Intake-Runner-Length.png

Wave-Pulse-RPM-Chart.jpg

vgdx4.jpg

and a dial caliper
calipersaa.jpg


ID point out that different cylinder head designs, port sizes and even different cylinder head ports on the same head tend to vary between manufacturers and part numbers for the same engine, and intake manifold runner designs vary even more,


EDL-7501_sSN.jpg

dualp.png


hly-300-110.jpg

singlep.png


WND-8501_AT.jpg


EDL-2925.jpg



Id also point out that cam timing matched to the exhaust scavenging has a huge effect on potential intake flow rates. and changes in displacement,cam timing, compression and header design have a very pronounced effect on intake flow rates
exhaustpressure.jpg

EXFLOWZ4.jpg

pistonposition2a.jpg

http://garage.grumpysperformance.co...spacers-and-related-intake-modification.1038/




if you decide to build a serious street/strip performance 496 BBC, taking the effort to do the required math seldom hurts,
obviously increased cam duration required a matching increase in static compression, if the engines to run at max efficiency.
youll generally want to be looking at about a 3" to 3.2 square inch cross-sectional area,
cylinder head intake port, (generally 280cc-325cc ports)
6.385" connecting rods with 7/16" ARP rod bolts a 4340 forged crank and pistons,
a cam in the 235-255 intake duration at .050 lift, 2.19-2.30 intake valves and 1.88inch exhaust valves,
open chamber aluminum heads, and about 10:1-12.5:1 compression,
and an auto transmission
converter stall speed in the 3000 rpm-3500 rpm range, an intake with the potential to feed 850 -1000 cfm minimum
and a low restriction exhaust.

btw the most horse power per dollar spend, in an old school big block engine ,
is generally available from a 540 cubic inch combo, (4.25" stroke and 4.5" bore) and about a 13.5:1 compression ratio BBC,
with a individual runner 8 stack FUEL INJECTION intake OR DUAL QUAD TUNNEL RAM COMBO,
its rather easy to get 650-700 hp and 700 ft lbs of torque from a decent combo,
you'll want a decent roller cam with maybe 255 degrees at .050 lift duration and maybe a .650-.680- lift and 1.7:1- 1.8:1 ratio roller rockers
if you select decent approximately sized 335cc-340cc-355cc port aluminum heads ,
and 2.25" headers with about a 33-36" primary and an approximately a 18"-20" long and 3.5"-4" diameter collector.
yeah, exceptionally well tunned combos with good matched parts frequently can exceed that power level, but thats the base line to shoot for

heres some calculators you might use
from a cost and parts availability vs the potential power levels you can generally expect there's
several BBC engine sizes that have consistently proven to perform rather well


the more common larger displacement combos ,these are
468 cid =454 .060 over bore stock 4"stroke crank
496 cid =454 .060 over bore + a 4.25" stroke crank
540 cid= 4.5" bore + a 4.25" stroke crank
572 cid=4.5" bore + a 4.5" stroke crank
632 cid=4.6" bore + a 4.75" stroke crank
displacement = bore x bore x stroke x 8 x .7854

1/2 stroke + rod length+piston pin compression height,
should roughly equal block deck height ,

plus or minus a few thousandths,
minor adjustments in compression,
due to head gasket thickness and what the piston deck height is are common
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























gear spread sheet that comes in handy THANKS TO 1FATGMC

HERES OTHER INFO LINKS

















a few resources to allow you to calculate the ideal results
http://www.tmossporting.com/tabid/1805/Default.aspx

here's some different calculators

http://www.kb-silvolite.com/calc.php?action=comp2

http://www.wallaceracing.com/dynamic-cr.php

http://www.smokemup.com/auto_math/compression_ratio.php

http://not2fast.wryday.com/turbo/com...pressure.shtml
average the results
 
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bbcstrokr.png


UN-machined SBC blocks have a nominal 9.0" deck height,
its very common to have the deck on a previously undecked block actually measure 9.022"-9.025"

SBCprintCustom2.jpg


kinsler-1-jpg.8075

link too bore vs stroke info on hundreds of engines
http://users.erols.com/srweiss/tablersn.htm

http://garage.grumpysperformance.com/index.php?threads/big-block-chevy-info.710/#post-60300

http://garage.grumpysperformance.co...-displacement-street-engine.10961/#post-48359

http://garage.grumpysperformance.com/index.php?threads/tall-deck-big-block-related-threads.10391/

http://garage.grumpysperformance.com/index.php?threads/which-496-bbc-engine.12291/#post-60423

http://garage.grumpysperformance.co...g-block-head-comparison.319/page-2#post-56649

http://garage.grumpysperformance.com/index.php?threads/build-a-496-stroker-bbc.101/#post-49427

http://garage.grumpysperformance.com/index.php?threads/block-choice.10472/#post-43984

http://garage.grumpysperformance.com/index.php?threads/scat-cranks-related-info.10930/#post-47993

http://garage.grumpysperformance.co...apless-top-piston-ring-sets.10555/#post-44980

http://garage.grumpysperformance.com/index.php?threads/block-prep.125/page-2#post-58033

http://garage.grumpysperformance.co...-on-the-cheap-well-to-start.11739/#post-55365

http://garage.grumpysperformance.com/index.php?threads/what-big-block-is-it.11655/#post-54494

http://garage.grumpysperformance.com/index.php?threads/scat-cranks-related-info.10930/#post-47993

http://garage.grumpysperformance.co...-15-years-later-after-long-term-storag.10443/

http://garage.grumpysperformance.co...g-block-pushrod-guide-plates.4596/#post-52034

http://garage.grumpysperformance.com/index.php?threads/build-a-496-stroker-bbc.101/#post-49427

http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/page-2#post-49183

http://garage.grumpysperformance.co...-calculators-and-basic-math.10705/#post-72061

http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/

http://garage.grumpysperformance.com/index.php?threads/picking-a-cam-for-street-strip-496-bbc.13384/

http://garage.grumpysperformance.co...-car-craft-magazine-big-bang-big-block.10830/

http://garage.grumpysperformance.com/index.php?threads/striders-540bbc.1356/


UN-machined BBC blocks have a nominal 9.8" deck height,
its very common to have the deck on a previously undecked block actually measure 9.822-9.825

BBCbott.jpg

The concept of port matching an intake manifold to a head is to ensure the flow of air to the cylinder is as big, smooth, and efficient as possible for maximum power. By ensuring the mating surfaces of the intake manifold and head have holes that match perfectly will help air flow through the engine.





 
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whats the most effective compression ratio for a gas engine
I was recently asked why I don.t build a new 496 BBC like I posted about having built back in the very early 1970s,
well theres two huge issues, the first one everyone deals with in most car projects,
its a lack of CASH flow but I have learned a great deal in the intervening decades.
, well the major REMAINING issue, OTHER THAN THE VASTLY INCREASED COST OF PARTS,
is the availability of high octane fuel and avoiding detonation issues.
the days of easy access too $.34 cents a gallon SUNOCO 260 are unfortunately now just a distant,
but pleasant memory
but E85 has some significantly increased octane potential if your willing to deal with some issues


Did you mean: what's the most effective compression ratio for a gas engine


https://garage.grumpysperformance.c...c-vs-static-compression.727/page-2#post-94269






 

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