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Thread: 57 4 Door Hardtop - First Trifive

  1. #21
    Registered Member chevynut's Avatar
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    Quote Originally Posted by NCW View Post
    I have a set and have at some point measured them at 1.00" Offset to the pass side. I just thought it might be of interest to some if the need was present. I wonder if in the GTO the engine is centered and the mounts are used for a clearance issue? I may have to review the part numbers on the set I have. It's interesting how some parts crossover and can be used. Do they (Vette) reside in stock (on K frame) location specific to your design or land elsewhere?
    All I know is both the left and right side mounts for the C5 Vette are symmetrical, and basically mirror images. We don't use the stock k-member mounts because the C4s never had LS engines.

    The passenger side Corvette mount is casting #10260643 and the driver's side is #10260642. They can be reversed on the engine but then the cushion hole moves.

    The GTO uses the #10260642 driver's side mount and a different #92056790 passenger side mount. Don't know why the passenger side is different.

    Here's a pic of the GTO mounts:





    I don't see how the mounts could offset the engine, though, depending on where you weld in the frame mounts. The bolt hole on the driver's side is the same distance from the engine centerline as ours is. So if we dropped an engine using those mounts in our frame and lined up the driver's side, the engine would be centered. Not sure if the passenger side would fit because it looks like it may be longer.

    I think the GTO uses the same cushions as the Corvette, but we don't use them.
    Last edited by chevynut; 07-16-2017 at 04:11 PM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  2. #22
    Registered Member Fladiver64's Avatar
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    Nick, I have not set an engine on them yet but they look centered. Laszlo, I have to say they guys helping with the swap were very impressed with conversion frame, body dropped right on, just had to cut the pinion snubber out and we forgot to remove the e brake assembly from the body, but the who;e swap when rather smoothly. I dont have the correct tires on it but with a 10" shock height on the front the frame rail at the front fender is about 4 3/4" and the stance looks great.

    My assumption was the front suspension the top a arm should be parallel with the ground at ride height, what is the proper relationship for the rear half shafts? should they be parallel? or run slightly down toward the tires?

  3. #23
    Registered Member chevynut's Avatar
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    The proper ride height is with the steering tie rods level, and the lower a-arm slightly down at the balljoint. However, we set everything up so the a-arm is level. In the rear again the halfshaft should be just slightly down at the outboard end, but we set them up level. You can run both suspensions a little higher or lower as long as you align them at that height.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  4. #24
    Registered Member NickP's Avatar
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    Been trying to add an image, won't take it
    Last edited by NickP; 07-17-2017 at 03:43 PM.

  5. #25
    Registered Member chevynut's Avatar
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    Quote Originally Posted by NCW View Post
    Been trying to add an image, won't take it
    I see it. The GTO mount is a little wider and taller than the C5 mount. I wonder why they did it like that when they already had a part that should work. But it could still be used with a centered engine if the passenger side mount was moved over. It wouldn't even fit on our frame mounts with the C5 mount on the other side.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  6. #26
    Registered Member NickP's Avatar
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    GM, who knows.

  7. #27
    Registered Member Fladiver64's Avatar
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    If it was a Ford all four mounts would be different parts

  8. #28
    Registered Member Fladiver64's Avatar
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    So I was cleaning off the floor to see what I really had and there seams to be a seam sealer type of material in some of the joints ( see Pictures) is this factory or added at some other time? Do I need to grind it out if the floor is solid there? It looks like the previous floor repair and trunk patch were fiber glassed in so they will get removed. It looks like the area in front of the seats on both sides and a small patch in the trunk so far.IMG_20170719_184045.jpgIMG_20170719_184039.jpgIMG_20170719_184016.jpgIMG_20170719_183953.jpg

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