Earl's Oil Fill Cap - 10 AN Female O-Ring Vent - Twist-On - Black RS004C18 02" heads require additional piston

02" heads require additional piston to valve clearance

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Earl's Oil Fill Cap - 10 AN Female O-Ring Vent - Twist-On - Black RS004C18 02" heads require additional pistonThese 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 Fitting (or Port hose end) & AN hose to the catch tank or PCV. These caps eliminate the need to modify your valve covers when adding a catch tank to your racing engine (required by most sanctioning bodies in racing applications). Choose from two versions w one that