99Hawk120

Does anyone know if the LT1 motor uses the same bolt pattern on the crank as the standard Gen I Small Blocks with a one-piece rear main seal?

I've got an LT1 flywheel I'm trying to bolt to the ZZ4 in my 84 and the two bolt holes on either side of the dowel hole do NOT line up. The other four line up perfectly, and so does the dowel hole.

It's obviously an LT1 flywheel because my LT4 pressure plate and McLeod disc bolt up to it just fine. I just can't bolt the flywheel to my crank. I tried another one-piece SBC crank I had lying around and it wouldn't bolt to THAT either.

Did I just get a flywheel with two holes drilled by retarded monkeys, or does the LT1 crank have a different bolt pattern?? I would think enough people have done this by now I would have heard if you needed a special flywheel or something ...

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"Beware he who would deny you access to information, for in his heart, he dreams himself your master"

'84 Black Camaro ZZ4 M5 (V-6 in a former life) -- street beast
'91 Medium Blue Metallic Z28 A4 (UB-HSTRY's old ride) -- currently broken
'99 Navy Blue Metallic Firehawk #120 M6 (99.44% stock) -- daily driver

Birmass

The LT1 crank has the same bolt pattern as all one-peice cranks. Maybe you have a funked up flywheel.

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88 firebird formula
350 Vortec TBI
214int/224exh, .471int/.491exh
Edelbrock headers
SIX-speed
open 3.73's
2 1/4 stock catback
I love pissing those LS1's off
My Formula

All your base are belong to us.

95Z28A4

I like your "retarded monkeys" theory. I presently have a T56 flywheel & tranny bolted to a ZZ4 in my S10. The flywheel bolted up without problems.

Mike