Competition Cams 875-16 Reduced Travel Hydraulic Roller Lifters for Small Block Chevy 305 and 350c.i. Engines Originally Equipped with Hydraulic Roller Cam， 1987-Present， Including LT1 and LS Series<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>.842” diameter; 122g weight; 2.60” seat height</li><li>Designed to perform at higher engine speeds</li><li>Minimize internal piston movement to allow higher engine rpm</li><li>Lifter pre-load should be set at zero to 1/8 of a turn of the wrench on the rocker arm adjusting nut for optimal performance</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31WZHru8HML.jpg" noproxy>