Hydraulic Roller - Xtreme Energy: Best for serious street/strip use with 10.5:1+ compression and 3000+ stall. Needs good intake, headers and ported heads.; 294/300 Advertised Duration, 242/248 Duration .050", .540"/.560" Lift, 110 Lobe Separation; Adjustable valve train required; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump;
