what if any are the differences between heads....
i realize cams are different,
maybe valve sizes. . .
combustion chamber size. . .
M54 is a dual VaNos head.
M50/S50/M52/S52 is a single VaNos Head.
M50 and M52 are very similar. The S50, S52, and M52 carry the same “400” casting number, the M50 is a different casting, though as far as I know the M50 accepts the M52 head. The S52 has higher seat force springs .
M50 and S50 have two head temperature ports drilled and tapped, M52/S52 has a single temperature port.
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Last edited by bluptgm3; 01-19-2018 at 08:40 PM.
And M54 heads don’t fit M50,M52,S50,S52. They do fit M52TU that is a dual vanos motor used on the 99-00 E39 528i.
And probably a bunch of Euro cars.
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