[LMSRACER]

Originally Posted by PAUL K

Good Job Larry! It looks like you might be debunking an old PY myth. Have you noticed any distinct difference in cylinder wall thickness between blocks?

I most Certainly Have..... In Fact, the Last Time I Built a #485428 455, I had a hard time finding one that I was comfortable Boring to 4.215". All of them would go to 4.180", but at 4.215" they were getting pretty thin. Every Block that I Sonic Tested was a #485428.

What I've found is that finding a Block that can go over 4.200" is kinda' rare. Unless you want Bores that are less than 0.095" in Thickness. I try to stay above 0.100" in "Non Thrust" Areas of the Bore and above 0.150" in the Thrust Areas. If you're Racing, then "Hard Block" is Your Friend.

Have a Good One,
Larry S.