LS1 LS2 LS6 LSX Engine Pushrod Length Checker 6.80" to 7.80" Push Rod 7702-1Feature: Save yourself a lot of guess work to properly figure out what pushrod size you need for your engine build. Pushrod Length Checkers are crafted from a steel alloy with black oxide coating for years of accurate measurements. They are easy to read and eliminate the need for expensive calipers. Having the correct length pushrods in your engine is a critical factor in proper rocker arm geometry and these are the best tools to measure pushrod