Got my timing cover off and got problem
Trending Topics
The Best V8 Stories One Small Block at Time

OP, your motor cam sprocket is an LS1 sprocket, original equipment. The one you bought is an LS2 cam sprocket. The raised area is not a counter-weight. It is for a cam position sensor. The LS2s and newer engines moved the cam position pick-up from behind the intake to the cam sprocket. This does not effect you. Its a direct replacement, dont worry about the difference in the sprocket.
As for the cam retainer plate o'ring, it cannot be replaced to my knowledge. The only way to replace it is with an entirely new plate. This is available on the used market and new from GM parts. No after-market options are available to my knowledge. This o'ring typically lasts the life of the engine.
PS: The replacement has countersunk holes and requires new bolts and a different torque value. Contact SDPC for more information. Here is a link to the GM plate information: Link







