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  #31 (permalink)  
Old 07-24-2010, 10:09 AM
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I just saw this, in another thread:
Quote:
Originally Posted by miles
Has anybody out there put a 871 on a 455 olds. apparently I jump before I did my homework. Here is what I got, 1972 455 olds with J heads remanfactured engine.Casting no 396021F, I run a compression test and it come out to 180 psi which the people at BDS told me is a 11.24.1 compression ratio...
This would seem to agree w/what I remembered, as the 11.24 is derived by subtracting 14.7 from the 180 psi reading the OP had given BDS.

And, no- I didn't read this thread before I posted above. I'm rather anal about citing sources, and this would have been no exception.

Last edited by cobalt327; 07-24-2010 at 10:19 AM. Reason: Remove g.
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  #32 (permalink)  
Old 07-24-2010, 10:37 AM
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Quote:
Originally Posted by cobalt327
I just saw this, in another thread:This would seem to agree w/what I remembered, as the 11.24 is derived by subtracting 14.7 from the 180 psi reading the OP had given BDS.

And, no- I didn't read this thread before I posted above. I'm rather anal about citing sources, and this would have been no exception.
Do I understand right then that my ratio at 175 pounds tested is 10.9-1?

I know I should be able to understand and when I hesr it I'll go "Ah he11 ya" but for the life of me it just wont hit me why you take an atmosphere(14.7) right off the top?But holy frig, that still leaves me with a stiff comp ratio. Maybe thats why no one can believe how strong my 9.75-1 engine runs?
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