Hydraulic Roller - 4-Pattern: Great all around choice for street applications in modified engines and 2500+ stall or manual transmission.; Outboard Specs: 283/295 Advertised Duration, 231/241 Duration .050", .622"/.610" Lift, 108.5 Lobe Separation; Inboard Specs: 281/293 Advertised Duration, 229/239 Duration .050", .619"/.606" Lift, 107.5 Lobe Separation; 2300 to 6600 RPM range; Recommended use with 1.6 rocker arm ratio
