the plastic gear works with any material cam. best bet is to ask the cam maker what to use. i went to the plastic gear cause the metal one showed wear after break in.
You might want to check with the Cam manufacturer. Every cam is different. I converted to a solid roller just last year with a Comp Cam and they said to go with a solid steal gear.
The ford roller cams do well with a Ford steel gear.
Last i checked ( about 3 years ago before polymer gear) they were only talking about a bronze gear for Aftermarket roller cams because the cam was hardened differently than the ford rollers.
But now that the polymer gear is out Ive heard nothing bad about it but the price. About $120 ,but the ultimate wearing piece.
From Comp Cams' website:
Bronze Gears
One of the first requirements when installing a steel roller cam is the addition of a bronze distributor gear. A stock cast iron gear is not compatible with a steel camshaft. COMP Cams® gears are machined from AMPCO-45 extruded aluminum bronze with 5%Nickel added. These gears feature a high-strength tooth design that resists wear even when used with high pressure oil pumps.These extra tough gears are the answer when higher mechanical properties are demanded.
The solid roller cam in the Fastback required a bronze/brass gear. I originally thought that a steel gear would work; but was told that "solid" rollers needed the bronze gear (as opposed to a hydraulic roller using a steel gear). I wasn't about to test the cam maker's advice on my own, so I have been using the bronze gear (from MSD) as recommended. When it gets close to 2K miles on the bronze gears (cruizing/some racing), they typically show enough wear that I replace them. However, I've purchased one of those polymer gears and will have it installed on the distributor shaft in anticipation of the coming season. I hope it lasts longer than the bronze ones. It was good to here that others have had success with the plastic gears.
Bronze is an alloy of copper and tin. In the period of classical antiquity it had a low tin content, generally containing less than 10 percent, because tin was less common and therefore difficult to obtain. Like bronze, brass is an alloy, this time of copper plus zinc.
It is often very difficult to distinguish between bronze and brass merely by their appearance.
Sorry, I meant to say BRONZE, But you know what I meant. LOL
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