Ford Big Block 429-460 1968-1995 Advertised Duration: 285/291 Duration @ .050": 250/256 Valve Lift w/1.73 Rockers: .606/.618 Lobe Separation Angle: 110 LC Included Lifters: 91218 Direct Lube Mech. Flat Tappet 3800-7800. Rough idle, street/strip. Best with 10.0:1+ CR, 3000+ stall.
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