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Thread: Exhaust Manifold

  1. #1
    Join Date
    Oct 2006
    Location
    British Columbia, Canada
    Posts
    10

    Default Exhaust Manifold

    Has anyone changed the lefthand Exhaust manifold on their Duramax for an aftermarket one without the clearence for steering column shaft? Am being told that the factory manifold flows 20% less with this indentation than the other side, and that it is not necesary.
    84 GMC Sierra Classic 6.2, 2WD reg cab
    98 GMC Sierra Z71 6.5 TD (SOLD)
    2007 GMC Sierra Classic EC 2500 LBZ, Cognito leveling kit, Rancho RS9000X shocks, JJ Nerf Boards.
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  2. #2
    Join Date
    Oct 2006
    Location
    British Columbia, Canada
    Posts
    10

    Default

    84 GMC Sierra Classic 6.2, 2WD reg cab
    98 GMC Sierra Z71 6.5 TD (SOLD)
    2007 GMC Sierra Classic EC 2500 LBZ, Cognito leveling kit, Rancho RS9000X shocks, JJ Nerf Boards.
    Firestone Air bags, 285 Mickey Thompson Baja MTZ tires. 8' Aluminum Marathon Sled Deck.

  3. #3
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    You will not feel the difference, but loking at it tells a guy that it's a imbalance. Changing it should help balance the exhaust flow between cylinders.
    Kennedy Diesel-owner
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  4. #4
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

    Default

    Of those who have installed a pyrometer in both the right and left exhaust manifolds, all (that I've heard about) have reported a higher EGT reading in the driver's side manifold - including myself. But.... I have not heard of any of these dual installations using calibrated and matched pyrometers & gauges.

    Jim

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