351-400M Motor mod - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 08-30-2003, 06:18 PM
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351-400M Motor mod

Has anyone swapped 351C heads onto a 351-400M motor. I have the heads (1970 351C-4V, closed chamber), but I heard there was a spacer kit or something you had to use to adapt to the new cleveland style manifold. Thanks for your help!
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post #2 of (permalink) Old 08-30-2003, 09:54 PM
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Re: 351-400M Motor mod

why do you want to use those heads on a bronco?

I had them on my 70 Torino & 71 Mach I many years ago but with 11.4-1 compression ratio and the fact the ports and intake valves are larger than that of a 454 GM, they dont kick in till over 4K RPMs and require real high octane gas to overcome their inherent detonation problem due to C.R. and combustion chamber shape.
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post #3 of (permalink) Old 09-04-2003, 07:08 AM
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Re: 351-400M Motor mod

That's alota breating. The ports on those heads are huge. They will fit though if that's the answer you were looking for.
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