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

Grumpy · Jun 19, 2018

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

Compression Ratio Calculator - Wallace Racing

Stan Weiss' - Engine Bore, Stroke, Rod Length, Ratio Table

Bore, Stroke, Rod Length, Ratio Table

users.erols.com

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

David Vizard and Stan Weiss'' - Programs designed to Help Cylinder Head Optimization and Cam Selection

Programs designed to Help Cylinder Head Optimization and Cam Selection

www.magneticlynx.com

Connecting Rods

Connecting Rods sold by SCAT Crankshafts, the leader in high-performance engine components for over 50 years.

www.scatcrankshafts.com

BBC Rods | 396 427 454 502 | Molnar Big Block Chevy Rods

Molnar BBC rods. Big selection of H beam big block Chevy connecting rods. Standard, stroker, turbo, power adder, power adder plus and small journal.

molnarrods.com

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

Bbc Related & Links And Useful Info

a few useful links, and sub links videos, and tips to look over yeah, increased displacement helps and building a killer BBC old school, for your car can be both cost effective and produce impressive results some of the most effective, cost per hp and efficient combo's , will be the 496...

garage.grumpysperformance.com

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

Another 427 Tall Deck Truck/Marine

I am building this engine and I know you have a lot of links and post but (no offense) its like an unorganized library. I dont know where to look. So here goes: I am planning on using stock block 473478, stock tall deck intake 364462, Holley 850 cfm doublepump manual choke carb 4150, stock...

garage.grumpysperformance.com

Big-Block Chevy OE And Aftermarket Block Variants

Generation Gap: Big-Block Chevy OE And Aftermarket Block Variants By GREG ACOSTA AUGUST 07, 2018 https://garage.grumpysperformance.com/index.php?threads/some-basic-bbc-math-to-get-you-thinking-about-your-potential-dream-bbc-combos.14607/#post-96895 When it comes to big-block engines, there...

garage.grumpysperformance.com

SRP 297250: Forged Flat Top Pistons Big Block Chevy 572 ci [4.560 in. Bore] - JEGS

Get the Best Performance with SRP Forged Flat Top Pistons Big Block Chevy 572 ci [4.560 in. Bore] 297250 parts at JEGS. Shop Now at the Guaranteed Lowest Price!

www.jegs.com

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 ,

Connecting Rods

Connecting Rods sold by SCAT Crankshafts, the leader in high-performance engine components for over 50 years.

www.scatcrankshafts.com

BBC Rods | 396 427 454 502 | Molnar Big Block Chevy Rods

Molnar BBC rods. Big selection of H beam big block Chevy connecting rods. Standard, stroker, turbo, power adder, power adder plus and small journal.

molnarrods.com

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

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

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

Catalog info on P bearings:

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

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.

ideal port cross section

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

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/

(X) or (H) PIPE

Would be interesting to see some dyno testing to see how much BSFC changes with the typical injection mode and then change to End-of-Injection mode. Agreed. A few scientific studies found that, with the engines that they tested (Zhai and Lai 1995 and Berkmuller 1997), that an open valve...

garage.grumpysperformance.com

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

Grumpy · Aug 10, 2019

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.

Grumpy · Oct 14, 2019

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

and a dial caliper

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,

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

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

Engine Size and Compression Calculator

Tech Equations - ThirdGen.Org

The following equations and rules apply only to 4-cycle engines powered by pump gasoline. The equations have been simplified for ease of understanding. Answers will approximate, but generally close enough for use as a guideline. It is recommended that you round your result to the nearest...

www.thirdgen.org

Interactive Holley Jet Correction Program

http://www.rickwrench.com/bunchofcalculators.html

Calculators - Ford-Trucks.com

Air Capacity » Air Capacity, Volumetric Efficiency, Street Carburator Size, Racing Carburetor Size Average MPH and MPG » Miles Per Gallon, Miles Per Hour Brake Horsepower » Horsepower, Torque, Brake Specific Fuel Consumption, Brake Horsepower Loss Center of Gravity » Location Behind Front...

www.ford-trucks.com

Hotrodworks.net - Ballistic Parts

Thanks for stopping by, Hope you enjoy the what you are about to checkout, ( just Basic Hot Rod Stuff for your viewing pleasure.) There are several reasons why it was developed. First, they dig Hot Rods (duh) and doing artwork. Second, The Demand and response from people online wanting my...

hotrodworks.net

http://kb-silvolite.com/calc.php

Wallace Racing: Dynamic Compression Ratio Calculator

Simple Horsepower Calculator

Engine Tuning Calculator - using dew point

Stan Weiss' - Automotive Performance Software / Interactive JavaScript to Calculate Engine's Compression Ratio (CR)

JavaScript Calculators designed for the auto enthusiast. Which will do math for YOU. Interactive JavaScript to Calculate Engine's Compression Ratio (CR)

users.erols.com

Automotive Performance Software / Interactive Calculators

Computer program designed for the motor sports enthusiast. Performance software that does the math for YOU, also Interactive JavaScript Calculators.

users.erols.com

Density Altitude Calculator - English/Metric

http://www.diamondracing.net/cocalc.htm

http://www.crower.com/misc/valve_timing_chart.html

Carburetor Tuning the Scientific Way

http://www.ondoperformance.com/page2.html

Camshaft Technology and Calculations

Inlet Runner and Peak Torque Calculator

http://www.engr.colostate.edu/~allan...ngth/pipe.html

Bonneville & Land Speed Racing Spreadsheets

RC Fuel Injection > Technical

gear spread sheet that comes in handy THANKS TO 1FATGMC

Bonneville & Land Speed Racing Spreadsheets

HERES OTHER INFO LINKS

Optimum Rear Gear

Stan Weiss' - Automotive Performance Software / Interactive JavaScript to Calculate Speed(MPH) for given RPM, Rear Gear Ratio and Trans Gear Ratio

JavaScript Calculators designed for the auto enthusiast. Which will do math for YOU. Interactive JavaSript to Calculate Speed(MPH Km/H) for given RPM, Rear Gear Ratio and Trans Gear Ratio

users.erols.com

Stan Weiss' - Automotive Performance Software / Interactive JavaScript to Calculate Speed(MPH) for given RPM, Rear Gear Ratio and Trans Gear Ratio

JavaScript Calculators designed for the auto enthusiast. Which will do math for YOU. Interactive JavaSript to Calculate RPM for given Speed(MPH), Rear Gear Ratio and Trans Gear Ratio

users.erols.com

Stan Weiss' - Automotive Performance Software / Interactive JavaScript to Calculate Rear End Gear Ratio needed

JavaScript Calculators designed for the auto enthusiast. Which will do math for YOU. Interactive JavaScript to Calculate Rear End Gear Ratio needed

users.erols.com

http://users.erols.com/srweiss/transc.htm#tabtop

http://users.erols.com/srweiss/transc.htm#Auto

http://www.pipeflowcalculations.com/airflow/index.htm

Exhaust Header Design Comments

http://www.uucmotorwerks.com/html_pr...torquemyth.htm

http://tom.marshall.tripod.com/exhaust.html

http://www.engr.colostate.edu/~allan...a/effarea.html

http://www.engr.colostate.edu/~allan...ngth/pipe.html

Primary Header Tube Length by JavaScript

Calculate Header Tube Length - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules!

www.pontiacracing.net

Intake Runner and Peak Torque Calculator

How Do Exhaust Headers on a Car Work?

If you're planning to make more power from your engine. Switching to hi-performance exhaust headers are a good idea. Find out how exhaust headers work to improve engine performance.

auto.howstuffworks.com

Auto-Ware (Autoware Inc) Error page

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

Grumpy · May 5, 2020

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"

Bbc Related & Links And Useful Info

a few useful links, and sub links videos, and tips to look over yeah, increased displacement helps and building a killer BBC old school, for your car can be both cost effective and produce impressive results some of the most effective, cost per hp and efficient combo's , will be the 496...

garage.grumpysperformance.com

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

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.

Port Matching - Intake & Head Porting - Tech - How To - Circle Track

A tech article on match porting your intake manifold and heads. Find all the details inside Circle Track Magazine

www.motortrend.com

Kenny Bee 194 · Jan 27, 2023

Here is a more complete list of BBC bore and stroke combinations.

Kenny Bee

Grumpy · Jan 31, 2023

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

Discussing Compression Ratio And Pump Gas Compatibility

How much compression can you safely run when burning pump gas? Jeff Smith talks about what's safe and a few concerns you should have.

www.chevyhardcore.com

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

Dynamic And Static Compression Help

Hello everyone. I have something i am needing help with. And i would be ever so grateful for any advice. I have a 1994 chevy 3/4 ton 4x4. Extended cab it has 3.73 gears and a built 4l60E trans. 1800 stall. The engine in it now is getting pretty tired and i am fixing to start putting...

garage.grumpysperformance.com

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

https://garage.grumpysperformance.com/index.php?threads/dynamic-static-comp-ratio-cranking-pressure-calculator.4458/page-2#post-94144

Basic Math On Fuel/air Ratios That Gets Ignored

1 cubic foot of air at standard temperature and pressure assuming average composition weighs approximately 0.0807 lbs. (at sea level) that simply means it takes 12.4 cubic feet of air to equal one pound, your best engine torque is generally found at a fuel/air ratio near 12.6:1 , thats 12.6...

garage.grumpysperformance.com

calculate required octane for compression ratio

What else influences your car's octane requirements? IF YOU DON,T LIKE READING SUB-LINKS, AND LOOKING AT CHARTS , AND DOING A BIT OF MATH 'AND INDIVIDUAL CALCULATIONS, YOUR UN-LIKELY TO BENEFIT FROM MOST OF THE THREADS, ON THIS WEB SITE! LIKE IN MOST AREAS ITS KNOWLEDGE AND THE ABILITY TO THINK...

garage.grumpysperformance.com

why would you swap to ethanol?

why are people, specifically in the hot rod world swapping to e85 gas. I see the slight cost difference but the energy released is not as much. so i see it as you need more fuel to do what gas does.. just wanna know why. i do get the lines ( gas is more corrosive for regular fuel lines ) and...

garage.grumpysperformance.com

https://garage.grumpysperformance.com/index.php?threads/hp-vs-tq.16482/#post-100311

tumble and swirl, quench & squish

This is interesting :like: I have read (on forums...) that there can be too high squish velocity when engines are under high boost. NA engines not so sensitive i think? But if super much squish was of benefit, then would all engine makers already have it?

garage.grumpysperformance.com

Grumpy · Feb 20, 2023

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

The Grumpy Grease Monkey mechanical engineer.

The Grumpy Grease Monkey mechanical engineer.

The Grumpy Grease Monkey mechanical engineer.

The Grumpy Grease Monkey mechanical engineer.

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