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Thread: 72-73 cylinder heads - what do I have?

  1. Yesterday, 09:37 AM #1
    Jesse-911E 1969
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    72-73 cylinder heads - what do I have?

    What do i have?

    I have found a set of 6x cilinder heads, it seems to be correct for ‘72 and 73 911S with casting number 911.104.307.1R

    Can anyone confirm?

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  2. Yesterday, 01:15 PM #2
    72targa
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    Moved to Technical. Good luck with your search for info.
    Peter Kane

    '72 911S Targa
    Message Board Co-Moderator - Early 911S Registry #100
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  3. Yesterday, 09:07 PM #3
    Jesse-911E 1969
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    Thanks Peter!
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  4. Today, 04:28 AM #4
    Claudecot3
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    There was a thread about cylinder heads either here or on the bird's forum with someone having compiled a excel sheet of cylinder heads casting number and specs.
    It ain't complete and I wouldn't want to share publicly a work that isn't mine without being able to give proper credit to the person.

    Your casting number isn't listed in it though.
    Given the dates and the "307" I would think this might be some "S" heads. Measurement of the intake and exhaust ports if they are original would help a lot.
    Just as a reference point: 911.104.307.0R casting were 1970 "S" heads, the records I have are late 69 production (for 2,2L).
    Ports measurements; Intake: 36mm Exhaust: 35mm

    1972 S would be 36/36 from the file, but I don't have any prints from Porsche about this (as there were up to 1971).

    Good luck
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