block Id
I have a sbc with the casting number 3914638. It has a TII30DF stamped on the pad at front of block. Book says the number is a 327, 4 in bore but it measures 3.875 like a 307. Numbers on front indicate a 1968 307. It is a big journal crank. Could this have been intended to be a 327 and instead is a thick 307? Has not been cleaned or sonic tested so I don't what that looks like. Let me know what you think.
Mark
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