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Yeah, it depends on what material the cam is ground on, more specifically what material the drive gear on the came is made from. (popular option is to have a standard iron gear pressed onto a steel cam core) Best to call the cam manuf if you have the cam card.

If it's a GM steel roller cam you can likely use the GM Melonized gear w/o worry.

If you don't know what the material is, you can pull the cam and look at the numbers (big job)

You could use a bronze gear (ugh).

If you have a stock oil pump you could use a Comp Polymer gear (what I use) High volume pumps tend to chew them up.

Maybe get ahold of Chris Straub and see what he recommends you do. http://www.straubtechnologies.com/
 

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If it is a cast hyd roller you can run any gear on it.

If it is a billet camshaft you have to run a bronze gear.

If it is a billet with a press on gear ( 2pc camshaft) you can run any gear.

Note a Bronze gear is safe on any cam core.
 
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