Comes with standard .200" of travel. Oversized Diameter (0.843" - 0.8435"). Standard size is 0.8420" to 0.8423" OD. Machined from a steel body and designed to exceed the needs of large lift camshafts and higher valve spring pressures with a slower bleed down rate. RACE SERIES lifters maintain proper oil flow to the top end; increase engine RPM; valve-train stability; decreasing valve float promoting maximum valve lift.Feuling recommends Race Series lifters for engines running higher than 185 Lbs. valve spring seat pressure. FEULING recommends the use of a high volume oil pump which will result in quieter; better performing lifters. Race Series lifters are compatible with either FEULING HP+ or Race Series oil pumps and are designed for use with both street and strip engines. Spin-Tron dyno developed and track proven; Made in the USA. • 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! • Recommended for both strip and performance street engines• Sold in sets of 4• Made in the U.S.A. *FEULING RECOMMENDS PUMPING UP EACH LIFTER BY HAND PRIOR TO INSTALLATION; TO REMOVE ALL AIR AND PROVIDE A FULLY PUMPED UP LIFTER. USE OF A THIN WEIGHT OIL LIKE ATF IN A SQUIRT CAN WORKS WELL. See Fe