Forged or Cast
hmm thought they had forged pistons and cast crank i beam rods maybe i have something different i am thinking about whats the safe max operating rpm? that might tell you something 6000 and lower probably cast
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Thread Starter
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Joined: Jul 2005
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From: Midland
I guess Year One is retarded. Their catalog says Nodular Cast Iron, when all the other sources I listed listed it as forged. The reason it startled me was because I think I saw that somewhere else too, and that would **** me off if I did have a cast crank.
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Originally Posted by 91Z28
My car has a ZZ4 in it, and I've always wondered, cast or forged crank? Some places that sell it list it as forged, others cast.
My ZZ4 bottom end has been rock solid. I shift mine at 7200 and it's made more than 500 passes down the strip since i got. The crank has even survived about a dozen bottles of juice with a 200 shot.
I can't say the same for the ZZ4 pistons. 
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From: Midland
Originally Posted by uberLS-1
Who cares what the crank is made out of with those cast/hypereutectic pistons they use and the PM rods. LOL. The crank is the last part that is going to come apart in that motor.
you can tell if its cast or forged with the motor in the car all you have to do is look at the rear crankshaft flange where it mates to the flywheel i do it all the time when i buy old cores a cast crant will have a fine casting line where it was in the casting mold and a forged will have a fat thick line about the thickness of an eraser head or more where it was forged just drop your inspection cover and peek behind the flywheel might have to rotate the motor over to get it in sight now this only applies to 2 piece rear main engines dont know what the zz4 has but in my summit racing mag it states that its forged
