Ford Small Block 221-302 1963-1995 (Except 302 H.O.), 351W 1969-1996 Adv. Duration: 306/312 Duration @ .050": 253/259 Lift: .640/.640 Lobe Separation: 112 LC Included Lifters: 91213 OE Style Hyd. Roller 3200-7200. Small Base Circle, Best with big cubic inch. Needs 11.0:1+ CR, good heads. |