Porting the Edelbrock Pro Flow XT 7137

Discussion in 'Engine: Repairs , Modifications ,trouble shooting ' started by ASE Doc, Nov 22, 2017.

  1. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member

    I'm sure if you had an accurate flow bench, handy to test the results of that port clean-up work,
    you would find youve significantly improved the runners air flow potential
  2. ASE Doc

    ASE Doc Active Member

    What do you think about the exit of the second runner? Its the one on the right in the photo. Im really thinking maybe I should take the exits out to the full 1205. Forget leaving a margin. I actually think i left too much margin on the outside vertical wall of the first runner anyway. Didn't mean to leave that much.

    When I look at the photo, they both do look pretty good don't they. I just can't make up my mind. The taper is great as is. Guess I'll finish up the second and go on with the rest. I can always change things later. I'll never get them perfect anyway.
  3. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member

    yes I would take the intake port out(expand its cross sectional area)
    to within a couple thousands of the gasket edge ,
    over the whole perimeter,leaving the minimal visual exposed lip
  4. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    It's too bad that you don't have access to a Bridgeport milling machine.
    Your ports are slightly tapered rectangles. You can buy tapered end mills.
    Maybe 85% of the metal removal could have been done this way.
    Then, all that would be left is the blending.
    Similar to the picture below.


    I used this method on some SBC aluminum cylinder heads in the past.

    Do you have a technical school near you that has a machine shop and a weld shop?
    Last edited: Jan 13, 2018 at 8:02 PM
  5. ASE Doc

    ASE Doc Active Member

    I do have a friend who is a mechanical engineer and has put together his own machine shop at home. I don't know just what type of milling machine he has or of he TIG welds aluminum. I was thinking of getting in touch with him. I actually was able to rough out the second runner pretty quickly using a carbide. I'm not in a hurry anyway.

    Thank you Grumpy. That's the clarification I was looking for.
  6. ASE Doc

    ASE Doc Active Member

    I worked more on the first runner today and pretty well finished up the second runner, aside from some finer surfacing with 120 grit sandpaper. I matched up the runner floors and took the overall runner exits out closer to the gasket dimension. I think they look pretty good.

    I'll post photos tomorrow. Then start on the next pair.

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