These S&S adjustable pushrods are real "Time Savers". They can be installed without disassembling the engine. This makes installation of performance cams, rockers or performing other maintenance or repairs in less time as they allow removal of lifters and lifter covers up to 75% quicker. "Time Saver" pushrods are made from 7/16" diameter aircraft grade, seamless 4130 alloy chrome-moly steel that eliminates excessive pushrod flex to prevent for loss of cam lift and horsepower. The female ends are press-fit and then high-temp silver brazed where other manufacturers only use a press-fit. The adjusting end is as much as 40% larger than any other pushrod on the market. S&S "Time-Saver" adjustable pushrods allow quick removal of the lifter blocks, saving you up to 75% in time and labor. Available for Evolution Big Twin 1984 thru 1999 and Twin Cam models 1999 to present and come in a set of 4.