Quote: if you are gonna cut it 0,080" it would be like cutting a 340 0,040" over. Thats close to sonic testing territory already, specially with a block that has seen service life and has the water jackets a bit corroded.
Id just cut it to std 340 bore size at 4,04" if it will clean uo at that. Why push it if you dont have a sonic tester? Id rather have thick walls than 0,040" more bore. Its not like you are gonna shroud the valves!
I agree straight thick cylinders are far better.
Most pro builders don't put to much into bore size in a stock block. Most agree thicker cylinder walls are much better.
372 CI or 365 CI not much difference in HP. But!!! cylinder flex will lose HP.
