The wear pattern should be closer to the center of the distributor gear. Are you using the distributor gasket between the dist. hold down and the timing cover? Do you have any end play on the end of the distributor shaft? Is it a stock distributor or an after market piece? How about the timing cover? Are you getting enough oil and have you checked for cam walk. As you can see, there are a ton of variables here. Nick Alfano Date: Sun, 17 Oct 2004 21:13:46 -0400 From: TWINRICH@xxxxxxx Subject: Dist-cam gear alingnent To: mail@xxxxxxxxxxxx Message-ID: <ADVANCES623HvoFOAmE0000009e@xxxxxxxxxxxxxxxxxxxxxxx> I have lost 2 dist gears since I rebuilt my 390,It seems like the dist gear is wearing on the top like it is to deep in the hole is it possible to shim the dist so it doesn't go too deep or should I buy a new cover