The Edelbrock #60359 Performer Cylinder Heads are designed for use with 1965-95 289, 302 & 351W c.i.d. engine 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: • EQUIPPED WITH SPRINGS FOR USE IN HYDRAULIC FLAT TAPPET CAMSHAFT APPLICATIONS • High-flow 2.02" intake valves are for use with pistons notched for valve clearance • Will not accept rail rockers • 289-302 V8's require head bolt bushing #9680 and either head bolt kit #8552 (7/16") or stock bolts • Hardened pushrods required, use Edelbrock #9632 (flat tappet only). • Match with Edelbrock head gasket sets. • Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.