Our polished aluminum valve covers are to draw attention to your engine compartment. Available in short and tall heights with a 1-1/4” diameter breather hole positioned between the rockers to reduce oil splash. Valve covers are produced from a high-grade aluminum that is polished to Billet Specialties standards and each design is CNC machined in the USA. For the best seal, Billet Specialties recommends the use of a cork gasket with all of the valve covers we sell.