I just finished sonic testing a 428 CJ Block. The thinnest point I found was at the bottom of one cylinder at .138". That one spot about 3/4" from the very bottom on the Minor thrust side. Very small isolated spot then the numbers started going up. All other numbers were pretty stout. I'm assuming this block could safely go .060" over? Currently standard bore. If I remember all 8 Major thrust sides (thinnest measurements) were between .185" and .235". Did 8 points per cylinder. I was kind of surprised that the cylinders do seem to have a little bit of meat. At least on this one.
I have no plan on going .060" over.
