Earl's GM LS Oil Fill Cap w/ PCV Vent - 10 ORB Port These late model valve cover fill caps screw into the valve cover like an ordinary cap. These caps feature a baffle & -10 ORB (7/8"-14 Straight Thread O-Ring Style Port) for use w/ AN O-Ring...

Earl's GM LS Oil Fill Cap w/ PCV Vent - 10 ORB Port Oil Fill Cap w/ Baffle & -10 ORB Port - Fits Holley Cast Aluminum Valve Covers for the GM LS Series Engines w/ 1-5/16"-12 Threads on the Cap. These late model valve cover fill caps screw into...