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c4 engine and 6 speed

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Old Jun 22, 2010 | 05:10 PM
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Default c4 engine and 6 speed

1990 engine and box ,how difficult into a 1980 c3?

Last edited by turbovette80; Jun 22, 2010 at 05:12 PM.
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Old Jun 22, 2010 | 05:44 PM
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Engine is a bolt in, serp drive and all, trick is you will need electric fans so junk the shroud and maybe the radiator for aluminum....

tranny, maybe need to shorten the drive shaft...I dunno, I do know you need to that for a 700 tranny, but not sure about stick shifts...

probable have a shifter location issue, maybe change to hydraulic clutch m/cyl??

obviously a fuel pump....frame rail mounted worked fine under my '72 tank....

you maybe need to do aftermarket cal pak, and there is the obvious air cleaner/induction off the t-body....

I did one some 15 years ago, many changes over that time frame, but it's still a daily driver....

PM/email if you wish for more information....I have most documentation...

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Old Jun 22, 2010 | 06:29 PM
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I think for the 6-speed you need to mod the tranny tunnel.(that sounds a little perverted)
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Old Jun 22, 2010 | 08:04 PM
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The ZF6 is a huge trans... wont fit without mods to the tunnel. LT1/LT4 F-bodies used T56's that should bolt up pretty easy.
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Old Jun 22, 2010 | 11:10 PM
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Originally Posted by vette427-sbc

The ZF6 is a huge trans... wont fit without mods to the tunnel. LT1/LT4 F-bodies used T56's that should bolt up pretty easy.


The C4 Corvette 6-speed (ZF6) is too big. To fit it in a C3, you will need to cut out much of your tunnel.

Instead, use a 6-speed from a 1993-1997 LT1 Camaro or Firebird (T56). Much easier swap.
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