The Edelbrock #60389 Performer Bare Cylinder Heads are designed for use with 1982-95 50.L & 5.8L V8 applications. These Edelbrock Performer Series Cylinder heads are 50-state street legal and provide outstanding performance from Idle-5,500 RPM’s. The Edelbrock Performer heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. They also feature the highest quality intake and exhaust valves and valve springs.INSTALLATION NOTE: • Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. • These heads accept 1982-95 5.0L V8 pedestal mount rocker arms and valvetrain • 289-302 V8's require head bolt bushing #9680 and either head bolt kit #8552 (7/16") or stock bolts • Match with Edelbrock head gasket sets. • Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.