Distributor Drive Gear ??

[70jimmy]

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???????

 

[Slapperbar]

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

 

[bdozeraz]

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.

 

[kwissman]

.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.

 

[roadnotca]

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