This Comp Cams 34-331-4 BBF 280H Magnum Hydraulic Flat Tappet Camshaft fits the 429-460 Big Block Ford from 1968-1995. Comp designed this cam for street/strip use, and it features strong torque and a rough idle. A 9.0:1 or higher compression ratio, headers and a 2400+ stall speed torque converter are highly recommended. Comp Cams 34-331-4 BBF 280H Magnum Hydraulic Flat Tappet Camshaft Specs: For 429-460 cubic inch Big Block Ford engines from 1968-1995 Basic RPM Range: 2000 to 6000 Valve Lift Intake: .530 Valve Lift Exhaust: .530 Intake Duration: 280 Exhaust Duration: 280 Intake Duration at .050”: 230 Exhaust Duration at .050”: 230 Lobe Separation: 110 Intake Centerline: 106 Lobes designed to take maximum advantage of .875” diameter lifter Firing Order: 1-5-4-2-6-3-7-8 Made in the USA Notes: Stock (O.E.) valve springs can NOT be used. 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!