I just saw this, in another thread
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.