Feuling Race Series Short Travel Hydraulic Lifters - Standard 4050STNew revolutionary design with 0. 115in. of total travel vs. a full travel lifter with 0. 200in. These lifters will increase rpm by decreasing valve float and valve train harmonics while maintaining a quiet engine Travel reduction reduces the amount of oil that is required to fill the inside of the lifter which reduces oil aeration in the lifter on steep, fast action high lift camshaft lobes Short travel lifters should be set with 0. 065in. 0. 070in.