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  1. #1
    Join Date
    Aug 2004
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    338

    Default 307 to 350 frame mount, height difference?

    Searched but couldn’t find anything on this topic. Does anyone happen to know the height difference of a 307 frame mount as opposed to a 350 frame mount? This is of course, going on a 1969 Camaro

    Stuart Seitz


  2. #2
    Join Date
    May 2002
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    Default

    I thought they where the same height?Just the 350's where slotted on the pass side. Only diff were in the SBC (exc 302 & LT1)) and BBC ones.
    MrQuick ΜΟΛ'ΩΝ ΛΑΒ'Ε

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  3. #3
    Join Date
    Aug 2004
    Location
    DUBUQUE IA
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    285

    Default

    i would think thay would be the same. i have my 69 subframe out of my car right now and it had a 350. if you want me to check let me know

    barry

  4. #4
    Join Date
    Aug 2004
    Posts
    338

    Default

    Quote Originally Posted by MrQuick
    I thought they where the same height?Just the 350's where slotted on the pass side. Only diff were in the SBC (exc 302 & LT1)) and BBC ones.
    307 and 327 are the same, as are the 302 and 350 frame mounts.

    Quote Originally Posted by PRO TC
    i would think thay would be the same. i have my 69 subframe out of my car right now and it had a 350. if you want me to check let me know
    If you could that would be great, I need the measurement from the very bottom (the face that actually comes in contact with the sub frame) to the center of the hole, which I believe is actually more of an oval shape.
    Stuart Seitz

  5. #5
    Join Date
    Dec 2004
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    HILLBILLY HOLLYWOOD, TENNESSEE!!!
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    Default

    There is a different frame bracket for a 68-71 Chevelle with a 307 (GM #3980707 left & 3980708 right) and the 307 uses a smaller (different) standard duty engine mount.

    The 350/396/454 engines use frame bracket (GM#3980711 left and 3980712 right) with heavy duty engine mount GM#3990318.

    The correct frame brackets are not available at GM however any of the restoration houses will have the correct frame mount brackets. You can "force" a heavy duty engine mounts used on 350/396/454 engines onto a standard duty 307 frame bracket however it is tough. The engine will drop in with the correct frame bracket and correct engine mount. The problem with fitment when trying to use a 307 engine frame mount and 350/396/454 engine mount is on the passenger side. The 307 engine frame bracket is significantly smaller than the 350/396/454 bracket. Very obvious when sitting side by side. I cannot remember if or how much difference there is in height.

    I'll bet Camaro uses the same engine frame brackets for a 307 engine car as a Chevelle since GM was very much into using parts already available. Therefore when coverting a Camaro from a 307 to a 350/396/454 "I" think you MUST change the engine frame brackets just like in a Chevelle. Check your frame brackets as this is probably where you have problems. You need the correct engine frame brackets to solve your problem!
    Mike

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  6. #6
    Join Date
    Aug 2004
    Posts
    338

    Default

    Thanks for the input but I can't really "force" them in because I'm using solid mounts.
    Stuart Seitz



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