Quick question - with a BBB head I've always been under the impression that .015 of a cut would reduce the compression chamber 3cc. I've got a set of 661 heads that I'm trying to bring from 71 CC to 67-68cc, and thinking .020 ought to get me there.. Anyone been through this exercise recently? ( I did use the search and didnt come up with anything definative..)
NVM - Found this: https://www.v8buick.com/index.php?threads/455-combustion-chambers.197910/. Looks like .015 would be about right
.005 is 1cc with the smaller chamber heads. I did this myself and measured CCs before and after on a set of 430 1109 heads. I was working at a machine shop at the time..
