Hydraulic Roller - Xtreme Energy Computer Controlled: Best in 305 or 350 tuned port injected engines.; 264/269 Advertised Duration, 212/218 Duration .050", .488"/.495" Lift, 112 Lobe Separation; 1200 to 5200 RPM range; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump;
