And then compare what Larry posted above for a production build to the NHRA blueprint specs for the 455. (ignore the highlighted text). The heads and block are milled, and a thinner head gasket is used to get the compression up to the advertised spec. https://www.nhraracer.com/content/general.asp?articleid=46634&zoneid=132
So there was a stronger running first run of Stage 1's which the NHRA allowed even more block and head machining and the thinner gasket because of the quoted or rated factory specs that Buick offered? I really feel stupid asking this?
https://www.nhraracer.com/content/general.asp?articleid=46634&zoneid=132 https://www.v8buick.com/index.php?threads/interesting-read-d-sa-build-up.127970/
Yep, thats what Walt posted.. I need to re read it a little more.. Edit: Thanks for the 2nd link Larry...
Would there happen to be any info in or on the box as to what the recommended piston to wall clearance should be with those pistons?