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no they will not a 400 is a clevland series motor 460 is a 385 big block the only thing that they have in common is distrbutor and transmission bolt padern

460cid Heads will not fit a 400M because the 460cid is a 385 series big block. The 400M is a 335 series big block. The Cleveland motor is a different engine block all together; however the head bolt pattern and passage pattern on the 351M and 400M 335 series motors is identical to the 351 Cleveland. 351C heads will bolt to 351M and 400M motors, as will piston heads and intake. These improvements are great for performance improvements on the 400M, can push horse power from 165 stock to well over 300hp.

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Q: Will Ford 460 heads fit on a Ford 400m motor?
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