Generation Gap: Big-Block Chevy OE And Aftermarket Block Variants

By
GREG ACOSTA AUGUST 07, 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)...
garage.grumpysperformance.com
When it comes to big-block engines, there are quite a few variants across multiple manufacturers. However, when you hear the words “big block” with no other qualifier, there is one engine that comes to mind more than others, and that...
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you'll have that nagging feeling that you overlook or forgot "something" after most engine builds (UNLESS) you develop the habit of using a check sheet , and write down all the clearance specs on every build along with notes , on things like ring and bearing part numbers and bearing clearances, ring gaps piston to valve clearances,valve spring installed heights and spring bind, push rod length, piston dome cc, timing set part number, cam button clearance,head gasket thickness,combustion chamber volume, deck height, type of valve keepers, retainer and rocker part numbers , valve seat angles etc. etc.
and you won't have even 1/4 of the info without knowing what your doing, what to look for,why your checking things and how to check them, and having accurate measuring tools, like micrometers, dial indicators, plastigauge,a decent engine stand, bore gauge,and calipers
and a note pad with detailed checklists to follow (your memory is never infalible) and having reference material to check certainly helps
as with most things you have options and choices, and all the choices made result in potential requirements being matched in other parts selected,
verifying clearances , carefully checking dimensions and coatings and carefully hand fitting in many cases.
if you check you'll find hundreds of options and if you don't do careful research and,
measure precisely your sure to have made a few less than ideal choices
a bit of research starting with these links will surely help
and just as obviously posting direct questions about parts compatibility,
clearances and reaching your intended goals certainly helps
Tools, Procedures, and Testing trouble shooting
Engine Combos and Dynometer Database
a general list of components commonly found in such an engine:
and yes generally all parts selected should match the intended application's
operational rpm and power range as should the drive trains gearing
- Engine block (and main caps and bolts)
- Cylinder heads(head gaskets and bolts)
- Crankshaft
- Pistons
- rings for pistons (compression, second and oil rings)
- piston connecting rod pins
- cylinder head index dowels
- timing cover index dowels
- crank keyway
- oil filter
- oil pressure sensor
- crankshaft pilot bearing
- intake manifold thermostat
- block oil pressure sensor
- Connecting rods(including bolts)
- bearings (crank and rod)
- oil pump( plus mounting bolt)
- oil pump pick-up (remember to braze)
- BRASS freeze plugs (use sealant)
- oil passage plugs
- Camshaft (security plate and bolts)
- lifters
- push rods
- gaskets
- crank damper
- crank damper, washer and bolt
- timing chain
- timing chain set with cam and crank gears
- timing chain cover
- flexplate
- flex plate bolts
- pushrod guide plates
- rocker arms
- rocker arm adjustment nuts
- rocker arm studs
- valve covers
- valve cover bolts
- Valvetrain components (valves,spring shims, valve seals, springs,valve keepers,spring retainers)
- Intake manifold (gaskets and bolts)
- Exhaust headers (gaskets and bolts)
- Oil pan(gaskets and bolts)
- windage tray
- Water pump(gaskets and bolts)
- ignition wire and (ceramic spark plug boots)
- Spark plugs
- Fuel injectors
- Ignition system components
- DAMPER BOLT AND RETENTION WASHER