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Thread: Double plug heads

  1. 09-12-2012, 07:18 PM #1
    mike curnow
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    Double plug heads

    I have a set of 911 factory double plug heads dated 2/72, and casting number 911 104 303 2R. Does anyone know what engine they go to? The valves and ports seem to be the same as a 2.8 RSR.
    Mike
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  2. 09-13-2012, 07:12 AM #2
    PJenkins
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    Armando has a set of 2.8 heads on one of his sites. His castings are 3-73 and 911.104.322.0R

    http://www.pbase.com/slidevalve911rs...twinplug_heads
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  3. 09-13-2012, 07:31 AM #3
    2.5MFI
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    Well that's a casting number I don't see listed on my cross reference list. What is the casting marking? k1819n, k1819q, etc.
    Mark Jung
    MFI Werks
    Early 911S Registry #972
    Carrera T w/LWB, MT, RWS, PCCB
    72 T 66 x 100 MFI Twin Plug Coupe
    R Gruppe #686
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  4. 09-13-2012, 07:49 AM #4
    Mr9146
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    What's the stud spacing? Intake and exhaust valve sizes (forget port size as that's easily modified)? That will tell you quite a bit.

    PS: I found those pistons ... they're pretty beat ... They've hit the valves a few times.
    -Marco
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  5. 09-13-2012, 08:59 AM #5
    mike curnow
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    mark
    its k 1819m. valve size is i49mm out 41.50mm

    mike


    Quote Originally Posted by 2.5MFI View Post
    Well that's a casting number I don't see listed on my cross reference list. What is the casting marking? k1819n, k1819q, etc.
    Mike
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  6. 09-13-2012, 09:01 AM #6
    mike curnow
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    Marco
    80mm head stud spacing, intake valve 49mm, exhaust valve 41.50mm

    Mike



    Quote Originally Posted by Mr9146 View Post
    What's the stud spacing? Intake and exhaust valve sizes (forget port size as that's easily modified)? That will tell you quite a bit.

    PS: I found those pistons ... they're pretty beat ... They've hit the valves a few times.
    Mike
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