Our member @myersmetalworks just posted this video about an 1 hour ago about checking
clearances on a BBC rotating assembly.
Well done video !
.
clearances on a BBC rotating assembly.
Well done video !
Chevy 454 Big Block Engine Build.... Checking Oil Clearances And Installing The Steel Crank Shaft..
- Thread starter Indycars
- Start date
yeah, a very well done bbc assembly video ,
that covers a great deal
I've always been rather amazed at the number of people,
that assume you can just bolt , used and new engine components, randomly, together,
without checking clearances and then expect the result to run correctly!
I've seen guys order STANDARD BEARINGS and STOCK piston ring sizes,
for an engine refresh, and re-installed a cam and randomly re-installed the lifters,
having never measured or checked a single part...or how it fits,
and then look shocked when mismatched components fail.
a few related threads and as usual,
the sub links contain a wealth of info
http://garage.grumpysperformance.com/index.php?threads/a-few-basic-precision-tools.16344/
non-stoptransmission.com
http://garage.grumpysperformance.co...tion-of-crank-durring-short-blk-assembly.852/
http://garage.grumpysperformance.com/index.php?threads/bearing-clearances.2726/
http://garage.grumpysperformance.co...d-rod-orientation-clearance-issues-etc.16027/
http://garage.grumpysperformance.co...ng-rod-bolt-stretch-preload.11050/#post-85102
http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/
http://garage.grumpysperformance.co...-building-a-peanut-port-big-block-combo.2900/
http://garage.grumpysperformance.com/index.php?threads/bbc-build-advice.15921/
http://garage.grumpysperformance.co...e-springs-and-setting-up-the-valve-train.181/
http://garage.grumpysperformance.co...-on-the-cheap-well-to-start.11739/#post-55478
http://garage.grumpysperformance.co...y-in-building-a-good-engine.11682/#post-54682
http://garage.grumpysperformance.com/index.php?threads/bearings-and-oil-flow.150/
http://garage.grumpysperformance.com/index.php?threads/oil-system-mods-that-help.2187/
blog.dartheads.com
www.motortrend.com
www.enginelabs.com
that covers a great deal
I've always been rather amazed at the number of people,
that assume you can just bolt , used and new engine components, randomly, together,
without checking clearances and then expect the result to run correctly!
I've seen guys order STANDARD BEARINGS and STOCK piston ring sizes,
for an engine refresh, and re-installed a cam and randomly re-installed the lifters,
having never measured or checked a single part...or how it fits,
and then look shocked when mismatched components fail.
the sub links contain a wealth of info
http://garage.grumpysperformance.com/index.php?threads/a-few-basic-precision-tools.16344/
Torque Converter info for various transmissions
Converter information about dimensions, upper / lower limit measures and other info
http://garage.grumpysperformance.co...tion-of-crank-durring-short-blk-assembly.852/
http://garage.grumpysperformance.com/index.php?threads/bearing-clearances.2726/
http://garage.grumpysperformance.co...d-rod-orientation-clearance-issues-etc.16027/
http://garage.grumpysperformance.co...ng-rod-bolt-stretch-preload.11050/#post-85102
http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/
http://garage.grumpysperformance.co...-building-a-peanut-port-big-block-combo.2900/
http://garage.grumpysperformance.com/index.php?threads/bbc-build-advice.15921/
http://garage.grumpysperformance.co...e-springs-and-setting-up-the-valve-train.181/
http://garage.grumpysperformance.co...-on-the-cheap-well-to-start.11739/#post-55478
http://garage.grumpysperformance.co...y-in-building-a-good-engine.11682/#post-54682
http://garage.grumpysperformance.com/index.php?threads/bearings-and-oil-flow.150/
http://garage.grumpysperformance.com/index.php?threads/oil-system-mods-that-help.2187/
Everything You Wanted to Know About the Big-Block Chevy Engine
The big block Chevy is one of the most raced engine platforms in motorsports. We've compiled some history and a massive library of parts swap knowledge into a comprehensive resource. Read on!
blog.dartheads.com
Various Chevy Big-Block Casting Changes
We show you the latest Chevrolet big-block casting and how it differs from earlier versions. Tale a look at the changes here!
Differences In Gen IV, V, and VI Big Blocks | Ground Up Motors - SS396.com
What exactly are the differences between the generations of big blocks? The big block Chevy engine, AKA BBC, AKA Rat Motor, has been in production since 1965.
www.ss396.com
Generation Gap: Big-Block Chevy OE And Aftermarket Block Variants
The big-block Chevy has been around for 60 years and is still going strong. We look at the major generations within the BBC lineup.
Last edited:
true enough, but the video serves as a good reminder on how many things should be done and basically in what order
every part you choose is a compromise , and may require changes,
that cost you in time, money or performance to some degree,
and almost every part will require a bit of fitting or clearance work,
or adjustment to fit and function to get the best results
if it drops out of the package and bolts together as it drops out of the package,
its almost certain its not functional to nearly its full potential
your job is to think things through carefully and make sure parts fit and function to their full potential,
little things like checking piston ring end gap, verifying bearing clearances, and ccing the heads and checking piston to valve clearance, degreeing in the cam and verifying the valve train geometry, polishing combustion chambers, getting a decent 3 angle valve job, MATTER!
as always it really pays to think things through carefully,
use a build sheet documenting all parts used, machine work done or scheduled and the costs and time required.
this will inevetably result in your having to do some research and ideally not skip over important steps like checking clearances, valve train geometry , parts selection and compatibility issues or lubrication and ignition system issues
break the build down into sections like the block and required machine work, the rotating assembly, heads and valve train, lube and cooling systems, matching the injection, carbs or intake manifolds selected, matching the headers and exhaust system, and of course matching the drive train gearing, differential gearing, tires and brakes to the intended usage.
all of these steps require some research to get the ideal results
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 ,
www.scatcrankshafts.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
every part you choose is a compromise , and may require changes,
that cost you in time, money or performance to some degree,
and almost every part will require a bit of fitting or clearance work,
or adjustment to fit and function to get the best results
if it drops out of the package and bolts together as it drops out of the package,
its almost certain its not functional to nearly its full potential
your job is to think things through carefully and make sure parts fit and function to their full potential,
little things like checking piston ring end gap, verifying bearing clearances, and ccing the heads and checking piston to valve clearance, degreeing in the cam and verifying the valve train geometry, polishing combustion chambers, getting a decent 3 angle valve job, MATTER!
as always it really pays to think things through carefully,
use a build sheet documenting all parts used, machine work done or scheduled and the costs and time required.
this will inevetably result in your having to do some research and ideally not skip over important steps like checking clearances, valve train geometry , parts selection and compatibility issues or lubrication and ignition system issues
break the build down into sections like the block and required machine work, the rotating assembly, heads and valve train, lube and cooling systems, matching the injection, carbs or intake manifolds selected, matching the headers and exhaust system, and of course matching the drive train gearing, differential gearing, tires and brakes to the intended usage.
all of these steps require some research to get the ideal results
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
Last edited:
myersmetalworks
myersmetalworks
Thanks Indycars and Grumpy for the nice comments.... I really enjoy all the technical knowledge provided on this forum, and don't we wish it only took 15 minutes to check and correct the bearing clearances on a engine build... Wow... (The power of editing)