Questions on 71' 455

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Jan 9, 2008 | 09:27 AM

Trouble

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Joined: Jan 2008

Posts: 3

From: Houston, Tx.

Questions on 71' 455

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

Jan 9, 2008 | 12:25 PM

W30post

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Joined: Oct 2007

Posts: 91

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.

Jan 9, 2008 | 02:20 PM

Olds64

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Joined: Jul 2007

Posts: 18,191

From: Edmond, OK

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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