hi,
I know of sonic checkers, can i measure cylinder wall thickness (ball park) with a divider/caliper, 400 block has a big hourglass coolant hole so i can get in there
gary

No not and do a good job of it

This worked good after the fact. Could also file this under not enough for 700ish HP either

Lol awesome

One of the first 400 block stroker pump gas motors I built was thinner (.035 ) than that piece is after boring it to 4.375 bore size
The owner had it sonic tested by a shop close to where he lived, and he said they told him it was fine
That block cracked the #1 cylinder wall on the cam side after 3 pulls, it made 489 HP at 5500 RPM on the second pull
The whole side of that block was junk, I had a decent shop try to sleeve all four cylinders on the driver side, but it would't take, seal up, the sleeves
That was a 1976 block.

I have a mega block and assembly for sale now and “can it be bored to 4.500” is one of the first questions I get. When I bought it I already had a .055 over 440source kit and when I saw how nice the bores were at .030’i ordered a set of .030 pistons and had the assembly rebalanced. I wanted that extra meat