327/300hp Cam Specs - NCRS Discussion Boards

327/300hp Cam Specs

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  • Scott Marshall
    #1

    327/300hp Cam Specs

    Can anyone tell me the cam specs for a 327/300hp cam are? I lost my cam card that came with it and I am having trouble finding it online. Thanks.
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    • Mark Milner
      #2
      Re: 327/300hp Cam Specs

      A search of Yahoo brings up this site that has several cams listed.




      Corvette Camshaft Specifications
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        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43193
          #3
          Re: 327/300hp Cam Specs

          John-----

          It depends which year 327/300 that you're talking about. 1962-66 327-300hp used camshaft GM #3733431 (cast GM #3732798) and 1967-68 used GM #3896929 (cast GM #3896930).

          The early cam had lift of .399"I/.399"E and duration of 300 degreesI/300 degrees E

          The later cam had lift of .390"I/.410"E and duration of 310 degrees intake/320 degrees exhaust

          You may find varying specs for these camshafts from other sources. That's because different conventions were/are used to describe them.
          In Appreciation of John Hinckley
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            • Duke W.
              Beyond Control Poster
              • January 1, 1993
              • 15610
              #4
              Re: 327/300hp Cam Specs

              Best I can do for the 929 cam (late 300 HP) is .050" lobe rise duration:
              196/202, centerlines 108/116, LCA 112, lobe lifts .260/.273.

              Like Joe said the first design 300 HP cam is no longer available, but the
              929 will give essentially identical operating characteristics, with slightly better torque bandwidth.

              The duration numbers that Joe mentioned are based on GM's cryptic and never published measurement technique and can't be compared to modern cams' "advertised duration", which is usually speced per SAE J604d that specifies the timing points and duration at .006" valve lift.

              Based on SAE J604d the 929 duration would probably be near 250. Duntov SAE J604d duration (based on my measurements): 270/270; LT-1 277/293; 30-30 290/298.

              The L-79 duration (.050" lifter rise) is 221/221, which would probably yield about 270 SAE J604d duration.

              Duke
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                • Pete Whelan
                  #5
                  Re: 327/300hp Cam Specs

                  Scott,
                  These are the actual measurements taken at 0.004" tappet lift from a Sealed Power replacement cam (CS274) for a 327/300.
                  IO 15 BTDC
                  IC 63 ABDC
                  EO 61 BBDC
                  EC 27 ATDC
                  258I/268E Advertised Duration
                  Intake Lift @ Cam 0.2597"
                  Exhaust Lift @ Cam 0.2735

                  Pete
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                    • Scott Marshall
                      #6
                      Re: 327/300hp Cam Specs

                      THANKS ALL *NM*
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