Thread: sbc chev zz4

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Nothing wrong w/ a 2 bolt main block. You aren't into it that deep. Just build it as a 383.

Chances are good that these engines are original since they've have been in your possession - depending on the actual manufacture date, the '94 may still have the 14096846 (pink) rods. The '96 should have the newer (10108688) rods.

I am going to get some numbers and post. I don't like not knowing what I have.

OK both blocks have the 10125327. One block has v0421xpk on the front pad under the head.( I cannot find a number on the other yet. The head number on it is 12551561.)

Just realized I'm hoggin in. Sorry. I'll start my own.

10125327 casting number was used in 1992-96, 350 engines – both 2 and 4 bolt blocks. You already know they are reverse flow cooling.

V0421XPK translates as:

V = Flint assembly plant
04 = April
21 = 21st day
XPK = 1996 “F” body (Camaro/ Firebird), manual transmission, 275 - 325 horsepower (2 bolt is probably the lower figure [“F” body]. Corvette would have been a 4 bolt, 325 horsepower.)

12551561 heads were used on 1996 LT1s. Angle plug aluminum factory head with 2.00 intakes / 1.55 exhaust.

Glen, Is there a reason I dont find a number on the front pad of the other engine?