Questions on 71' 455

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January 9th, 2008, 09:27 AM

Trouble

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Questions on 71' 455

Does anyone know what the compression is on a factory 71' 455?

January 9th, 2008, 12:25 PM

W30post

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IIRC it was 8.5 to 1 down from 10.5 in 70. Be aware that a set of Felpro head gaskets on that motor can take it to almost 8.25 to 1.

January 9th, 2008, 02:20 PM

Olds64

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Also don't forget that when you rebuild the engine compression will be affected by pistons, and how much you mill the heads and deck (which changes combustion chamber volume).

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