Thread: big Block Help

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I'm not positive but the numders on the heads may shed some light on what the block is. I believe the 400 heads don't work on the 350 block ,,,but them I haven't worked on one if a few years

Have you found the ex. port numbers yet? Doesn't guarantee anything as the post 64 (65)? heads are interchangeable. 301s excepted. Also, although some other heads may bolt up, the heat crossover ports to the intake might need to be blocked or adapted. Not even talking about round (ex.) port heads as they are rare.

Jack.