Hydraulic Roller - Thumpr : High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.; 283/303 Advertised Duration, 227/241 Duration .050", .547"/.530" Lift, 107 Lobe Separation; Adjustable valve train required; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump;
