Reduces friction significantly and eliminates break-in problems Permits higher valve velocity, increasing performance while maintaining good manifold vacuum and drivability Permits higher valve velocity, increasing performance while maintaining good manifold vacuum and drivability. Ideal for high performance street use only and... They also permit higher valve velocity, increasing performance while maintaining good manifold vacuum and drivability. The roller lifters reduce friction significantly and eliminate break-in problems. Edelbrock 7102 Sbc Cam & Lifter Kit Camshaft / Lifters, Performer RPM Edelbrock 2231 Rollin' Thunder Hydraulic Roller Camshaft, SBC Headers, high energy ignition systems, lower than stock rear end gearing and a high performance torque converter in automatic transmission equipped vehicles are necessary to gain all of the performance in these camshaft kits. Dyno-matched to Performer RPM power packages Ideal for high performance street use only and not for heavy vehicles 2261 Camshaft Edelbrock BBC Hydraulic Roller Cam - 2261 - ID Speed Shop Street Performance Cam Intake valve lift with factory rocker arm ratio is 0., 625 and the exhaust valve lift with factory rocker arm ratio is 0., 639
