Aren't NOS castings beautiful? Even 8:1 is a nice increase over stock. Compression is like almost anything else a person gets to a point if diminishing returns. Going from 7.5 to 8.5 will add more power than going from 14 to 15:1. Something that I have always wondered: 1. Why do all older engines have such a low CR ?and 2. All big truck engines also have very low CR's even in the 1960's when good gas was around? Was gas in the 1950's low octane? Look at Chevy specs for "car" 283 and "truck"283 to see what I mean. Also look at 1960's 292 engines. They did not lower compression for unleaded gas no need allready low. I take it then that newer style 235 heads valves won't fit the '41 to '52 head. Thanks Stock49 again for taking the time to teach a newbe Jay
