The pre 67 block where called thick wall, but that was only in terms of the outside case walls , not the cylinder walls.
The 400 motor should have started life with the thickest cylinder walls of all of your blocks, and since you can get hold of a sonice tested I would prove that out!
Some 389 motors can go up to .090"over for a hot street motor as I did with one that I had for a ton of years, but if your building for compression ratios over 10.5 to one or hp numbers in excess of 500 then as posted above I would do atleast a half fill on the block if your going for .090" over.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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