The Edelbrock #60829 Performer RPM cylinder heads are designed for 1961-79 Chrysler 361-440 c.i.d. Wedge engine applications. The Edelbrock #60829 Performer RPM heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. These cylinder heads deliver great throttle response and power from 1500 to 6500 rpm. They also feature the highest quality intake and exhaust valves and valve springs. For use on pre-pollution controlled vehicles only.INSTALLATION NOTE: • EQUIPPED WITH SPRINGS FOR USE IN HYDRAULIC FLAT TAPPET CAMSHAFT APPLICATIONS • Cylinder heads flow 291 cfm on the intake and 217 cfm on the exhaust at .600" lift • Angled spark plugs for superior combustion • 88cc chambers are machined .100" for clearance with quench dome style pistons • For headers, contact TTI (951) 371-4878. • Vacuum advance distributor may not clear cylinder head. • Deck thickness: 5/8" • Pushrod diameter: 3/8"