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How to tell an M60b30 from a b40

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    How to tell an M60b30 from a b40

    Guy came up to me and complimented my car, told me he had an e34 in the past. Said he bought a replacement engine from a junkyard for it. Said it was the 4 liter and heíd let me have it for cheap as he got rid of his 5 series and itís just been sitting ever since. How can I tell the difference between the two? If itís like the m20 in any way Iím sure there are very subtle differences. What should I look for?

    #2
    Probably easiest just to check the engine block stamp, which is with the engine number on the block - you decipher it as follows (from the Turner site).... presumably the code will either start in 30 if it's a 3.0 or 40 if it's a 4.0.

    My e30: OEM+ with M30B35

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      #3
      where is the stamp?

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        #4
        Originally posted by LowR3V'in View Post
        where is the stamp?






        Sent from my iPhone using Tapatalk

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          #5
          also (but not as definitive as block stamping, since it can be swapped) is to look at the intake. the 4.0 has a 3.5" MAF and bigger runners on the intake manifold. the 3.0 has a 3" maf and skinnier runners.

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