Billet valve cover.

Billet valve cover for THUMP-AIR engines or billet cylinder head.  Features a built in reed style check valve to keep your oil and crankcase pressure under control.  Valve promotes negative crankcase pressure.  This valve cover also is extra tall to accommodate long valve lengths for big lift.  Available finned or flat top.  Flat to available with or without pad coating and engraving. Custom engraving available for extra fee. Comes with gasket.