Gessler or any Iron Head Flow Data

Discussion in 'Street/strip 400/430/455' started by oldschool85, Jun 2, 2023.

  1. oldschool85

    oldschool85 Well-Known Member

    Please post your Gessler or any other IRON flow bench sheets or data numbers.


    Attached are a few examples I have found.
     

    Attached Files:

    Last edited: Jun 2, 2023
  2. tdacton

    tdacton Gold Level Contributor

    These are my Herche / Zimmerman's heads on my Concours motor.
    Flow numbers.JPG
    Troy
     

    Attached Files:

  3. Stage 2 iron

    Stage 2 iron 480 IRON HEAD STAGE 2

    Untouched, iron head stage 2
    B5977A1A-3E28-41C0-9657-6B7BCC65E201.jpeg
     
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  4. Stevem

    Stevem Well-Known Member

    Here are some numbers.

    The first column is a stock 455 intake with its 2.00” intake valve, the 2nd column is the stock 1.625” exh valve.

    The third column is a bowl ported intake that has also had a 3 angle valve job done to max out the OD of the stock valve.
    Also on this test the valve was not back cut, so when that is done the flow numbers up to .200” will rise.

    the 4th and 5th column is the stock intake and exh flow of a stage II iron head with its original 2.135” and 1.75” factory valves.

    All numbers are at 28”

    .050”-—30.4–21.1–31.5
    .100”—60.9–47.3–60.9——-62.9—55.3
    .200”—122.5–97.4–128.2——-119.5—99.6
    .300”—177.6–126–189.4——-165.5—136.9
    .400”—208.3–142.6–218.5——-219.2—169
    .450”—216.2–147.6–231———-237—180.7
    .500”—218.5–149.5–234——-246.6—196.6
    .550”—219.6–151.5—————-258.6—204.7
    .600”————————————--264.5—213
    .650”—————————————267.4

    Note that at .600” lift with a 2 1/4” tube bolted on that the 213 cfm of exh flow of the stage II heads jumped to 232.

    Test like this must be done to get a accurate picture of what the exh to intake ratio really is when your picking out a cam.
     
    Last edited: Jun 3, 2023
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