Product Information Hydraulic Roller - 4-Pattern: Excellent for street/strip applications with good heads and raised compression in high RPM engines. 3200+ stall.; Outboard Specs: 295/307 Advertised Duration, 243/253 Duration .050", .638"/.622" Lift, 108.5 Lobe Separation; Inboard Specs: 293/305 Advertised Duration, 241/251 Duration .050", .637"/.622" Lift, 107.5 Lobe Separation; 2900 to 7200 RPM range; Recommended use with 1.6 rocker arm ratio
