Original 1985 Corvette Piston Specs?

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Mar 26, 2007 | 04:53 PM

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Race Director

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From: Manitoba

Original 1985 Corvette Piston Specs?

Hi guys, I am getting my engine rebuilt and we are trying to find a replacement piston that is the same as the original specs, the ones that were in there were not original and we can't find all of the specs. Would anyone know the following for an '85?

Number of valve reliefs
Compression distance
Wrist Pin Offset

Also my mechanic found a piston that ups the compression from 9.1 to 9.4, would this not cause any issues with the stock ecm settings?

Thanks!

Mar 26, 2007 | 06:37 PM

Midnight 85

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From: Hellinois

Finalist 2020 C4 of the Year - Modified

The 85 is a forged piston and has one valve relief only. The other measurements should be the same on any stock type Chevy 350 piston.

Mar 26, 2007 | 07:42 PM

CFI-EFI

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From: The Top of Utah

Quote:

Originally Posted by DF

Would anyone know the following for an '85?

Number of valve reliefs One.
Compression distance 1.560".
Wrist Pin Offset Not a commonly used spec. .060"?

Very similar to or the same as the SpeedPro/TRW L2417F.

Also my mechanic found a piston that ups the compression from 9.1 to 9.4, would this not cause any issues with the stock ecm settings?

Thanks!

I'd go for even slightly more compression of it can be done cheaply and easily. Keep your eye on the quench area. That could solve several problems.

RACE ON!!!