Magnum 253/253 H-Flat K-Kit BBC 396-454

K-KIT - Complete Kit Includes: Camshaft, Lifters, Valve Springs, Retainers, Valve Locks, Valve Stem Seals, Timing Chain Set, Assembly Lube (in flat tappet applications), Decals and Instructions. Camshafts control the amount of time that your intake and exhaust valves are open. An increase in camshaft size will increase performance while also increasing how rough your vehicle's idle is. This Hydraulic Flat Tappet Camshaft is for Chevrolet 396-454 c.i. 8 CYL. 1965-1996. It is for Hydraulic-Limited street use or Bracket Racing, requiring 10.5:1 compression, 3500+ stall or 4speed. 4.10 or lower. Radical Idle. All COMP Cams Camshafts are manufactured to the strictest tolerances. Rigorously tested and checked for quality. Features: Great high RPM power, Easy on valve train parts, Can be used with mild ratio rocker arms & traditional performance valve springs, Best with aftermarket converter & 9.5:1+ compression. CARB Warning: For race/off-road use only. Note: The cam will NOT fit 1965-1966 396 models that have an oiling groove in the rear journal.