GM runs melonized on billet core. A billet cam can have a press on cast iron gear. You may want to call the cam manufacturer. I did some serious research when my gear sheered and found the melonized to be the safest solution in most situations. It has longer service life than a bronze gear but should sheer BEFORE the cam gear. Factory cars ran a cast iron cam and distributor gear.
If you decide to stick with bronze, checking timing is important and so is the blocked bypass. One instant indicator of timing loss is a lower idle speed hot.
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Todd
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