will an m104 engine fit in a 87 300e??
if so will it match the older transmission??

MB put the 104 Motor in the 124 chassis in about 1990. The body is the same. The trans is about the same. It all should work.

It would be cheaper to just buy the newer car though.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician

If I remember correctly, the M104 is a 3.2 inline six, basically same block as M103 (if I am correctly recalling. Should fit in a W124 w/o too much shoehorning. Tranny should be OK as well. I haven't looked at this stuff in a while, so don't take this opinion to the bank.

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Jeff L
1987 300e
1989 300e
1987 BMW 325