a 350 is a small block those heads will fit on and Chevy SMALL block not a big block
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.
They should as they are the same block.
350 heads will bolt to the 400 block. They will need to be drilled for the "steam ports" in the 400 block.
Yes.
Yes. Same block, different stroke.
yep
Yes. basically the 351m is a Cleveland with a modified deck height.
it will fit on any Chevy SMALL BLOCK of the same generation of your LT1
The heads will fit the block, but the vortec intake manifold will not bolt to the old style heads.
the heads should fit as long as your not trying to put them on a big block
305 heads of course, 350 heads will fit for sure and possibly 400. obviously no big block heads will fit. a 305 with 400 heads gets you a little over 352. 350 with 400 heads is a 383. add and divide