This listing is for a brand new street performance hydraulic cam and stock style lifter kit from Elgin Industries for Ford, Lincoln, and Mercury passenger cars and trucks with hydraulic flat tappet style camshafts. Valve Lift (INT/EXH): .512″/.538″ 1.72 Rocker Ratio Duration @ .050″ (INT/EXH): 214°/224° Adv. Duration (INT/EXH): 292°/302° Lobe Centerline (INT/EXH): 107°/117° Fits 370 CID (6.1L) 1979-1997 429 CID (7.0L) 1968-1998 460 CID (7.5L) 1968-1999. This cam will have a fair idle with some lope with good midrange torque in the 2400-3200 RPM range and good operating power in the 2000-4800 RPM range. Street performance cams work best with slightly modified engines with compression ratio of 10.3-1 or less. Headers, dual exhaust, and 4 barrel carburetor recommended. Can use manual or automatic transmission with stock convertor. Axle ratio of 3.70-1 or higher is best. Recommended valve spring pressure: 110 lbs. closed and 280 lbs. open.