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Thread: Valve question

  1. #1
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    Valve question

    I have a set of 64 and a set of 65 heads. All but three have the valves. I bought a couple to complete the heads, but I think I bought the wrong ones.

    Exhaust valves seem to have a 38mm diameter and AUS KO P82 stamp, and the intake valves have a 34mm diameter.

    What should be the original specification for a intake- and exhaust valve on a 64/65 head?


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    According to this thread exhaust valves shoud be 35mm?

  2. #2
    Quote Originally Posted by Jesse-911E 1969 View Post
    What should be the original specification for a intake- and exhaust valve on a 64/65 head?
    Einlaß 39 mm
    Auslaß 35 mm

    Jon B.
    Vista, CA

  3. #3
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    Thanks Jon! Any idea what valves I have bought?

  4. #4
    Quote Originally Posted by Jesse-911E 1969 View Post
    Thanks Jon! Any idea what valves I have bought?
    Jesse, I can't think of any Porsche engine with a 34 mm intake valve. Even 356 with 1600 cc engines had 38 mm intake valves.
    A 38 mm exhaust valve was used in various Porsche engines from 1967-1972, including 911T, E, S and 914/6.

    Jon B.
    Vista, CA

  5. #5
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    Ok thanks!
    I will look for the correct valves ����

  6. #6
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    Here's a chart if it helps.
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    E Sully
    1973.5 911T

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