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  1. #1
    Join Date
    Sep 2020
    Posts
    9

    Default Metric a frame location help

    we are building a new chassis, imca stock car, we are allowed to fabricate the upper a frame mount and relocate it. We must use stock lowers, stock spindles and imca upper a frames. My question is, what types of things should I measure to get the optimum placement.

  2. #2
    Join Date
    Nov 2007
    Posts
    162

    Default

    You are kinda limited by the required upper a-frame. The a arms will get into the tires before you can move them far enough to eliminate caster change. You can change roll centers some by using ball joints with longer stems, but choices are limited by the a arm.
    Then, you need to consider pro or anti dive.
    Moving them to get camber and caster needed can sometimes make bump steer problems.
    Even on the modifieds, some chassis builders have opted to stay with the stock mounts to keep stock geometry.

  3. #3
    Join Date
    May 2007
    Location
    in a van down by the river
    Posts
    1,763

    Default

    I assume you are building a Metric Chassis?
    May look at the square body Caprice (gen 3 77-90), or the Gen4 91-96
    I know the 3rd gen stuff the spindles are taller, and share parts with Camaros/Firebirds.
    you will also have a better chance of getting better Geometry with them.

    Not messed with any 4th gens, but i hear you can use those lower a arms on the metric, (are 3/4" longer) so they must be similar
    I think there should be lifeguards in the genepool.

  4. #4
    Join Date
    Apr 2009
    Location
    Marengo IN
    Posts
    246

    Default

    Your best option is to build some small tabs that you can cut and tack in place. Use a bump steer gauge setup and cycle it. watch your caster and camber gains/changes. Try many different locations until you get it where you want it. Like at 10 different mod chassis with chevelle or metric clips and you will find 10 different setups. Most of them work. Once you find the sweet spot you want fabricate your mounts to match.

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