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Header block offs

This is a discussion on Header block offs within the GM Trucks forums, part of the Vehicle Specific category; I just bought some stainless headers a y for my 03 5.3 silverado. My 03 is throttle by wire so ...

  1. #1
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    navy blue
    1998 camaro ss

    Header block offs

    I just bought some stainless headers a y for my 03 5.3 silverado. My 03 is throttle by wire so there is no EGR. I needed to know if anyone knows where I could get some block offs for these particular headers. I had them for my ss when I had manifolds on it, but I sold them when I put kooks headers on it. I'm not sure if they would of been the same and fit on these headers or not. If anyone know where and what style block offs I could find and use I would greatly appreciate your help. Thanks. Oh and the company I bought them off of(dynamo touring) was no help when I asked them. Also if any you guys could let me know what kind of performance increase and gas mileage I could expect from these headers? Their hooked up to a flow aster fatback and cold air intake, and will possibly getting a frost tune after. Thanks again fellas.

  2. #2
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    I'm surprised the headers didn't come with a block off considering some of these trucks didn't have EGR. You could probably make one if you're handy or I bet the F-body EGR block off is the same. If not the same it could be modified to fit.

  3. #3
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    navy blue
    1998 camaro ss

    Yeah i just ordered the billet aluminum blocks for an ls1 and they fit perfectly. Thanks

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    '02 WS.6 / '07 Suburban

    Tim - any chance you'll be joining us at GM Carlisle in June?

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