400 Sonic Test Results

slimjim said
I plan to keep this on the street for 95% of the time. Really don’t want to use hard block due to the high CA temps.

The shop recommended .02 over but, I’d like to go 0.032 over for a 4.375 bore. This is the first block I’ve sonic tested

The difference in the .020 and .032 overbore is .006 per side. If you can’t get .006 more out of an overbore, you are going too big to begin with.

IOW’s, if it will go .020 and be safe, an .032 overbore is fine.