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57 chevy frames? size question

Discussion in 'The Hokey Ass Message Board' started by bellyjello, Apr 5, 2007.

  1. bellyjello
    Joined: Aug 6, 2004
    Posts: 433


    Hey are a 2door hartop and a 2 door sedan frame the same?
  2. Yes, they're all the same except Convertibles, which have a big X-member to increase rigidity.
  3. Longbox55
    Joined: Mar 21, 2007
    Posts: 97


    You could use a convertible frame for a hartop if you wanted to. GM actually did this on the factory race cars (Black Widow) to stiffen the frames for racing.
  4. bellyjello
    Joined: Aug 6, 2004
    Posts: 433


    OK thanks guys. I have a guy coming tomorrow I wasn't sure. I advertised it as a 2dr sedan frame on his last call he said he had a hardtop....
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  5. Play400
    Joined: Nov 29, 2006
    Posts: 47


    Apparantely there are 2 designs, a 1 piece boxed or a 2 piece welded boxed frame rails. From what I heard the 1 piece is more desirable and has slightly different measurements.
  6. Shane T.
    Joined: Jun 21, 2005
    Posts: 910

    Shane T.

    Dimensions are all the same .
  7. Half-Fast
    Joined: Apr 1, 2007
    Posts: 41


    I think the difference is the number of body mounts.
  8. Brad54
    Joined: Apr 15, 2004
    Posts: 6,008

    from Atl Ga

    Convertibles had an X in the middle of the standard frame to stiffen the body.
    Black Widow race cars were 2dr Sedans (Post), not Hard Tops.

    One-piece box frame versus 2-pc C-channel welded together: The width dimensions from inside frame rails Right-to-left are slightly different, some mounting holes for leaf springs, etc are slightly different, but overall dimensions are the same, and you can swap them.

    Station Wagons had some extra body mounts, compared to the regular passenger cars.

    That's about it.

    You'll be fine with the one you have coming.

  9. raffman
    Joined: Sep 28, 2005
    Posts: 658


    Dimensions are not the same, inside frame rail to framerail is wider for the two piece. something like inch and a half.

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