LIFTERS RAC OS .8435 17M8Caracteristicas: Full travel hydraulic lifters made from machined steel Exceed the needs of large lift camshafts and higher spring pressures with a slower bleed down rate Maintain proper and critical oil flow to valves, springs, rockers, shafts and valve guides Increase engine rpm and valvetrain stability; decreases valve float for maximum valve lift Recommended for both strip and performance street engines High volume oil pump recommended.