45thou thick and a bit bigger than bore size and are done on standard bore there are some factors that will make it different but it is within .25 of the amount of comp
so 4k with 4k head 9:1
4k with 5k head 14.88:1
5k with 5k head about 9.08:1
5k with 4k head and 9cc dish pistons 8.38:1
5k D dish with 4k head 6.87:1
5k shallow dish with D dish head 12.2:1
ask if you want to know any more head block config's
so 4k with 4k head 9:1
4k with 5k head 14.88:1
5k with 5k head about 9:1 i think not 100% sure
5k with 4k head and 9cc dish pistons 8.38:1 and if anyone knows the cc of D dish pistons i can get some more up
hey can you bore a 4k to take 5k pistons or do the bores get superthin i was thinking maybe the 4k is a 5k with really thick bores so maybe you can go out to 5k size pistons