From the oil pump, oil travels through the filter and into the block. After the initial 20 to 30 minute run-in of a new engine and camshaft, it's a good idea to drain the oil (with the engine still warm) and install new oil and a new oil filter. Neophyte engines produce a lot of small and sometimes microscopic debris. The adapter and spin-on filter, which began appearing on '68-and-later Chevy V-8s, is available from your GM dealer or Mr. Gasket. The Mr. Gasket adapter sells for about $18 (PN 1272).