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Cleveland engines use this two-bolt thrust plate to keep the camshaft in place. Thrust plates with Torrington bearings are available from Summit Racing and Comp Cams, and can free up some power by reducing friction. The two plugs are for the main oil galleries. The Cleveland oiling system gives priority to the cam bearings at the expense of the rod and main bearings, which gave the Cleveland a reputation as a "bearing spinner" at high rpm.