Forged cranks are generally preferred for performance work, but for most street engines the use of a forged crank is purely a luxury. Prior to 1963 all cranks were made from forged steel alloys, but nodular iron has long since become the standard crankshaft material. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. basically this means 'its used in everything', whereas. If youre looking at the casting information and it mentions 3970010 'A/F/X/Y/B'. If youre looking at the engine code - this is already known. Use these casting numbers to identify the block you have. Small Block Chevy Suffix Codes: TBT - TJS. I aplogize for not being more specific.the "010" is obviously a factory cast-in number(raised).not "stamped"like those metal stencil is by itself on the drivers side of the engine block and can be seen from under the vehicle.i'll get off my lazy $*# and try to find the casting number on the top rear of the block next to the firewall.,i know its gonna be a bitch.i'll try using a small mirror and a flashlight.ugh!i just finished replacing the upper exhaust manifold gaskets.there were no gaskets on the drivers side and all gaskets were in place on the passenger side except the rear one was half gone.found the leak!no more !the drivers side manifold had everything you could imagine bolted to it.rusted,rounded bolts and nothing wanted to go back in place like it came off.8 hours on that side alone.one hour on the passenger side.i love working on used vehicles that are neglected and abused.but a 1985 silverado for 250. All small-block Chevrolet crankshafts are made from two basic materials. Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbers.
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