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Thread: M30 to M35 swap?

  1. #1
    Join Date
    Nov 2022
    Location
    Milwaukee, WI
    Posts
    2
    My Cars
    72 Bavaria

    M30 to M35 swap?

    Hey guys, first post, just joined because I saw a lot of M30 swaps via google searches on this site, but I had a question. I've seen the swaps where people have grabbed the 3.5L out of an e34 or something, but then you have to deal with fuel injection and all that. Rather not do that... seems like a pita.

    My question is... can I just swap the longblock? I know the mounts and oil pan are issues, but can I use the M30B35 longblock with all my M30B28 stuff like the head/accessories?

    Thanks in advance!

  2. #2
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,412
    My Cars
    F90 M5; E36 M3 Turbo
    We had a Bavaria with a 94 3.5L. I was not involved in the swap, which was done 25 years ago, but as I understand the late motors don’t have a distributor drive gear on the cam so the cam must be swapped or I think a Schrick cam has the gear if you want more performance. We had dual webers on ours and a 5 speed Getrag 265. Adjust the cam since if you don’t they can go flat — that happened to us during a period of neglect but the car suffered an accident and had some serious rust so I never got around to buying the Schrick.

  3. #3
    Join Date
    Nov 2022
    Location
    Milwaukee, WI
    Posts
    2
    My Cars
    72 Bavaria
    What do you mean by adjust the cam so it doesn't go flat? Thanks for the help. Picking up the engine tomorrow.

  4. #4
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,412
    My Cars
    F90 M5; E36 M3 Turbo

  5. #5
    Join Date
    Jan 2021
    Location
    Portland, ME
    Posts
    22
    My Cars
    1972 E3
    The combustion chamber must match to piston dome.

  6. #6
    Join Date
    Aug 2008
    Location
    Sydney Australa
    Posts
    2,482
    My Cars
    1x633, 1x E3 2 DR Racer
    My car was a M30B30, now runs an M30B35 with triple webers. So yes, just put webers on it. My engine puts out 370hp (Group A race engine) so performance is in now way harmed.
    1977 633 CSi RHD Euro. S38B38 3.9L M5 Transplant. 5 Speed Getrag Dogleg. 3.73 LSD. 417hp, 369lb/ft
    1971 3.0CS E3 2dr Alpina Special Coupe Racer, 347hp, 295lb/ft

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