Hydraulic Roller - Xtreme Energy: Good for towing, excellent mileage, smooth idle. Will work with stock converters and gears.; 252/258 Advertised Duration, 200/206 Duration .050", .472"/.480" Lift, 110 Lobe Separation; 600 to 4600 RPM range; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump;
