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Distributor Drive Gear ??

Discussion in 'The Garage' started by 70jimmy, Sep 14, 2006.

  1. 70jimmy

    70jimmy 3/4 ton status Premium Member GMOTM Winner

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    I am putting a Competition Cams 4 X 4 extrem cam in my new to me 350, also having heads rebuilt, new lifters and in the info with the cam they recommend putting a new distributor drive gear in. I have found Bronze, iron, and carbon ultra poly composite, also iron. Any opinion on what is better.

    Also it appears that you can get them in either a .491 shaft or .500. Is .491 stock size for GM HEI???????:1zhelp:
     
  2. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    Ask Comp. They'll tell you witch gear to run on their cam.
     
  3. bdozeraz

    bdozeraz 1/2 ton status

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    Definately ask the manufacturer. Regular flat tappet cams usually take an iron gear. A lot of roller cams need a bronze gear. You need to get the correct one for your application.
     
  4. kwissman

    kwissman 1/2 ton status

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    .491 should be the correct size for a GM HEI. 0.500 is for a MSD or Mallory aftermarket type. If you have a stock type cam with a cast iron gear, you should not need a bronze gear or plastic. The bronze are for billet cams that do not have the cast iron gear pressed on.
     
  5. roadnotca

    roadnotca 3/4 ton status

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    Just get the GM gear from dealer or GMpartsdirect(iron).
     

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