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  1. #1
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    Member No: 75402 m735is is an unknown quantity at this point m735is's Avatar
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    86 535is with dual intake valve springs?

    I'm cleaning up my 86 535is' cylinder head and what LOOKS like dual valve springs on the intake side.
    So I look up on realoem and see that my car shouldn't have come with them, just the regular single springs. I then look up m535i and it shows them (after 6/86). Did the previous owner have an m535i head??

    The car was an 6/86 535is US version. The head has an 86 stamped on it with the casting number 1 288 086 9.

    Can someone elighten me alittle? If this is a dual spring head, is it worth any more than a regular one. I know the purpose of the dual springs and everything else that has to do with the head components (cam, exhaust springs, valve sizes, the head itself) looks to be the same, just curious if they are relatively rare.

    I doubt my auto e23 will ever need dual springs, as an auto atleast, but I may just hang on to this one??? While I was cleaning it up, I noticed that the intake paths, valves and seats look brand new, maybe the PO did an upgrade before he/she sold it?

    Thanks in advance for the forthcoming lesson on this.Steve B
    4/85 e23 735i (summer/fall use)
    1/88 e32 735i (winter/spring use)
    6/88 e32 735iL (long term project)

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    Member No: 33285 88m53453 is an unknown quantity at this point 88m53453's Avatar
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    Re: 86 535is with dual intake valve springs?

    Some of the later m30 engines came with dual valve springs. Probably the PO installed or had them installed. I did that to my M90 custom engine years ago. It's a straight forward install to put them in an m30 b34 head

  3. #3
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    Member No: 75402 m735is is an unknown quantity at this point m735is's Avatar
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    I see that-

    my 86 535i is back for some e brake work, it has the same casting on the head. I don't know if it has the dual springs or not, I don't really care, just curious though.

    Any comments on my ebrake cable replacement thread a few down?Steve B
    4/85 e23 735i (summer/fall use)
    1/88 e32 735i (winter/spring use)
    6/88 e32 735iL (long term project)

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