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Thread: Change over to 7R crankcase

  1. 11-07-2008, 04:58 AM #1
    Tom F.
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    Timing of transition to 7R crankcase

    What were the engine serial numbers at which Porsche made the change to the 7R crankcase? I know that the change came about during the MY73 production run. I believe that the change was made to support the 911/83 2.7 RS motor. Every CIS T that I've seen has the 7R case, which is probably because the CIS T started production around the same time as the 2.7 RS.

    Does anyone have the change over numbers for the T, E and S engines?
    Tom F.
    Long Beach, CA
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  2. 11-07-2008, 08:34 PM #2
    jameshtaylor
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    Can't answer the question but my 73T, with motor number 613 5495 probably built May--July 1973, had the 7R case.
    jhtaylor
    santa barbara
    74 911 coupe. 2.7 redone by Competition Engineering; ported to 36mm, shuffle-pinned, boat-tailed, Elgin mod-S cams, J&E 9.5's, PMO's.
    73 Targa (much beloved, sold and off to a fine new home in San Francisco)
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  3. 11-13-2008, 06:18 AM #3
    dmcummins
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    I looked up that for a 73 CIS the serial # were 6133001 to 6136092.
    72S targa (sold)
    73t coupe
    71t coupe (project car)
    Gruppe B #057
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