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3.4 DOHC heads on 3x00 block

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  • 3.4 DOHC heads on 3x00 block

    Several people have talked about the possibility to use the 3.4 DOHC heads on the 3x00 engines. Some for performance, and some for replacment, where getting a 3.4 DOHC block might be difficult, but getting a 3400 (or even a 3100) block might be easier to come by.


    For these test fittings, I used a 1994 3.4 DOHC BLOCK, a 1994 3.4 DOHC REAR head, a 1999 3100 SFI BLOCK, and a 1996 3100 SFI head.

    This article is broken into 3 sections.
    • The first section is BASIC COMPARISONS where I compare the BLOCK of the 1994 3.4 DOHC, and the 1999 3100 SFI.</p>
    • The second section is a 1994 3.4 DOHC head on a 1999 3100 SFI block.The third section is a 1996 3100 SFI head on a 1994 3.4 DOHC block.



    This is the BASIC COMPARISONS between the 1994 3.4 DOHC, and the 1999 3100 SFI.</p> </p> This is a bare 3.4 DOHC block</p> </p> And this is a bare 3100 SFI block</p> One of the biggest NOTICEABLE differences is the OIL VALLEY. The 3.4 DOHC does not have lifter holes, and it has a cover on it. When the engine is ASSEMBELED, the valley is actually OPEN to the air, and not sealed off like the 3100. The 3.4 DOHC has that cover on it to keep anything from getting in there.</p> </p> Here is the cover on a 3.4 DOHC</p> </p> This is me holding the cover in place on a 3100 block
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  • #2
    a good machine shop recommendation 4 LQ1 engine

    Sirs,
    Is there a good machine shop that is up to rebuild this engine? Or modify it so that it can accept the small journal Chevy small block rods? Anyone know?

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    • #3
      you would be much better off just having the rods machined a bit to work-its been done though and there is an article covering it somewhere on here if you do a bit of searching.

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