C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

GM Crate Engine ID Help

Old 06-12-2019, 12:25 PM
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Default GM Crate Engine ID Help

Hello all,
I'm putting a GM crate motor into my 1986 corvette, and I bought the motor from a person who identified it as a GM ZZ4 crate motor. However, the engine ID is different than a ZZ4. The engine ID is VF 196027. Can anyone tell me about the history of this engine? I'm trying to figure out the cam specs and bore so I can re-flash my PROM. I'd prefer not to take it apart, as this engine was never used. I called Speedway Motors, and they think it's a version of a GM 604. I have no issues using a 604, as this is going to be a show car and I've put a much better cooling system into the corvette and I ordered a custom TPI system from First TPI which is being built for the fast burn heads in the motor.

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Old 06-12-2019, 07:57 PM
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I am 99.9999% sure that GM doesn't build the ZZ4 anymore.
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Old 06-12-2019, 08:52 PM
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Yes, thank you. I know the block was cast in 2010, is a four bolt main, with one rear main seal, based on the block code. However, the engine id is still the mystery.
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Old 06-12-2019, 10:52 PM
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There is some info stating ZZ4 is stamped on pad. There is another stamping beneath #4 & #6 exhaust ports. It may id engine. It may require valve cover and pan removal to id components then compare what you to GMPP Component Chart to know what you have
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