This Comp Cams 11-202-3 BBC 252H High Energy Hydraulic Flat Tappet Camshaft fits the 396-454 Big Block Chevy from 1967-1996. Comp designed this cam for street/strip use, and it features strong low-end torque and a smooth idle. A 9.0:1 or higher compression ratio and a 1500+ stall speed torque converter are highly recommended. Comp Cams 11-202-3 BBC 252H High Energy Hydraulic Flat Tappet Camshaft Specs: For 396-454 cubic inch Big Block Chevy engines from 1967-1996 Stock (O.E.) valve springs can NOT be used. Basic RPM Range: 800 to 4800 Valve Lift Intake: .460 Valve Lift Exhaust: .460 Advertised Intake Duration: 252 Advertised Exhaust Duration: 252 Intake Duration at .050”: 206 Exhaust Duration at .050”: 206 Lobe Separation: 110 Firing Order: 1-8-4-3-6-5-7-2 Made in the USA Notes: The 1965-66 396 has an oiling groove in the rear journal. This cam does not, so if you require the oiling groove, please contact us for a special order. Comp Cams designed this Hydraulic Flat Tappet camshaft for high performance on the street and drag strip. Comp Cams –The Absolute Leader In Valve Train Technology!