New revolutionary design with 0.115″ of total travel vs. a full travel lifter with 0.200″. These hydraulic lifters will increase camshaflt lift and RPM by decreasing valve float and valve-train harmonics while maintaining a quiet engine. The travel reduction reduces the amount of pushrod plunge and oil that is required to fill the inside of the lifter which reduces oil aeration inside the lifter on steep, fast action high lift camshaft lobes. When oil aeration is present inside the lifter, the p ushrod seat drops when the lifter rolls onto the front cam lobe ramp after squeezing the aeration down thus creating a noisy poor performing lifter.
*Precision ground needle roller bearing with high chromium steel axle for long life and minimal friction
*Cold forged extra long piston, precision ground and fitted for controlled leak down and pump up
*High flow disc style quick reacting check valve for better reaction at higher RPM.
*Available in oversized diameters Case Savers! #4018ST or #4019ST
*Recommended for engines with higher valvespring pressures and/or aggressive camshafts.
*Relief machined into the lower body to clear the flange on the camshaft front exhaust lobe on grinds using smaller than stock base circles
*Sold in sets of 4
Made in the U.S.A.
MFR PART No: 4017ST
ROLLIES PART No: FE-4017ST
