Hydraulic Roller - 4-Pattern: Best choice for smaller c.i. applications with very good heads. Extremely wide power range. 1800+ stall.; Outboard Specs: 271/283 Advertised Duration, 219/229 Duration .050", .603"/.590" Lift, 108.5 Lobe Separation; Inboard Specs: 269/281 Advertised Duration, 217/227 Duration .050", .600"/.587" Lift, 107.5 Lobe Separation; 1700 to 6300 RPM range; Recommended use with 1.6 rocker arm ratio
