PRO-TEK CIRCLE TRACK CAM KIT - CK-1090PK

Excellent camshafts for IMCA, Street, Hobby and Stock classes using a small block Chevy. Kit includes: 1) camshaft and 16) lifters. Rough idle quality with heavy lope-(note: intake vacuum will not operate power brakes, etc.) Good mid to high RPM torque in 3,800-5,000 range. Good high RPM power, operating range 3,200-6,500 RPM. Increased compression ratio required 10.5 to 1 to 12.0 to 1. Competition engine modifications required. Use with heavy duty manual or automatic transmission. Recommended spring pressure 125 lbs. for valve on seat: 325 lbs. for valve open. Axle ratio at 4.20 to 1 is best. Competition headers and valve job recommended. (Hydraulic: 240-255 Effective Duration) (Mechanical: 250-265 Effective Duration)