Thread: compression ratio

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I have a 402 block bored .30 over casting number 3969854 dated 71,trw pistons l2337 0.30,heads casting numbers 3935401 (427 truck heads from what I have gathered).I was wandering what kind of compression ratio I would have with the parts listed?

heads could be very big like 122? open chamber not good for a small bore. but i do not know the cc s off the top of my head they would need to be cc to check .that piston i have not seen that number the best way to do this is to cc that as well .then you can work out the CR . i found no numbers on the head cc or nothing on the pistons trw is not making any pistons and that number will not cross to speed pro that i seen