The 1947 - Present Chevrolet & GMC Truck Message Board Network - stock compression ratio on a 1985 C20 350?

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G-NUT

05-31-2018 11:47 AM

stock compression ratio on a 1985 C20 350?

Anyone know what the compression ratio is on bone stock 350 from a 1985 C20? Flat top or dished pistons?

Thanks

Alex V.

06-01-2018 05:31 PM

Re: stock compression ratio on a 1985 C20 350?

2 Attachment(s)

Looks like 8.2 or 8.3.

G-NUT

06-01-2018 05:33 PM

Re: stock compression ratio on a 1985 C20 350?

I have the LT9. So it looks like it's 8.3:1

Thank you very much for that.

YoungPup1977

06-03-2018 07:33 AM

Re: stock compression ratio on a 1985 C20 350?

Can you shed some light on why you needed this information ? Just curious.

G-NUT

06-03-2018 06:22 PM

Re: stock compression ratio on a 1985 C20 350?

I'm looking to add a "RV" cam, mild cam and heads. I'd like to keep my comp ratio to about 9.1 to 9.5. Looking at World Products 170cc runner, 67cc heads with 0.039 squish Felpro gaskets.

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