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Old 03-12-2022, 01:26 PM
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justincampbell justincampbell is offline
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Join Date: Jul 2006
Location: Ankeny, IA
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Default '68 400 H.O. compression and $ difference

Hey all!
I am corresponding about a 1968 Firebird 400 H.O.(I'm told). It is supposed to be correct and original.

I have 2 questions.
1) what is the compression ratio on this engine?
Just curious about buying fuel. I know someone who has a Firebird 400 that is 10.5:1 and that car doesn't run worth a darn on pump gas(pinging and vapor lock).

Also, what is the difference in value between a base 400 car and a 400 H.O.?

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