RE: pistons

[SB <polecat2@xxxxxxxx>]

All 413 car engines used closed chamber heads.  I thought they all were 
at least 10:1 compression?  I know the FelPro blue head gaskets will 
reduce compression slightly.  Open chamber heads will reduce the 
compression ratio by one full point.



Steve Mick wrote:
> 
> In another thread, Layne mentions his 413 pistons as being 9.7 to one 
> compression.  I am assuming that is for an early 1960's stock engine. My 
> question is: would those be for open or closed chamber heads? I am 
> wondering what the compression ratio would be for those pistons with 
> early 1970's open chamber 440 heads? And I know it would make a 
> difference if it were thin steel head gaskets or the thicker composition 
> gaskets- any input?


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