Hydraulic Roller - 4-Pattern .900" Base Circle: Great in larger c.i. street to street/strip stroker small blocks with good heads.; Outboard Specs: 301/313 Advertised Duration, 248/258 Duration .050", .637"/.621" Lift, 110.5 Lobe Separation; Inboard Specs: 299/311 Advertised Duration, 246/256 Duration .050", .637"/.621" Lift, 109.5 Lobe Separation; 2900 to 7200 RPM range; Recommended use with 1.6 rocker arm ratio
