This listing is for a Melling MTC-1 RV Torque Camshaft and Elgin Lifters for 305 307 327 350 283 400 Small Block Chevrolet's 1958-1995 with flat tappet lifters. Comes with Zinc additive for break In!! This is a good low end pulling cam for 4x4 trucks and cars. No noticeable sound through the exhaust. Cam specs are as follows: Intake/ Exhaust Lift .420"/ .442 Duration @ .050" Lift 201/ 214 Smooth Idle, Works well with Air Conditioning and Power Brakes Recommended with 4 BBL Carb