Thread: sbc chev zz4

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For a real ZZ4, the block casting number is 10105123

For a real ZZ4, the head casting number is 12556463, they are aluminum

You have neither so you dont have a ZZ4 engine.

your block casting number is a 1995-1999 350 for either a boat or a truck and has a 1 piece rear main

the head castings are 1987 to 1996 passenger car heads....not vortec (vortec heads have only 8 hold down bolts)

sorry

mike in tucson

Well, your 10243880 could be the “Real McCoy” as this casting number was in fact found on the 1995 to 2000 350s with four bolt mains, ZZ4 roller cam, and a one piece rear seal. Horsepower was rated at 330.

Or

You could have a 2 bolt Vortec truck engine, (also some Gen I Crate Motors) with a mild roller cam, one piece rear seal and about 220 horsepower.

NO real ZZX, ZZ3 or ZZ4s were built with 2-bolt mains

14101081 heads in any case are not from a ZZ4. This casting was used on 305 in 1987-88 Camaro. They have center bolt valve covers, 1.84 intakes and 1.50 exhausts with 58cc. They also came on some TPI 305's. They are not Vortecs