Just having a set of the Comp lifters won't be enough to help you out since different rocker arms require different length pushrods, and the difference between stock heads and different manufacturer's aluminum heads will also change the required length. You are pretty much going to need an adjustable pushrod to find your specific length needed.
Since there is no oil in the lifter, the pushrod plunger will continue to depress. I usually count the turns from zero lash (when slack is taken up) to bottoming out. say it is 2.5 turns which would be about 2.5*.050"= .125". If the preload is stated to be a half turn, then that is .025", so I would fully depress the plunger, go for my desired pattern, and then add an additional .100" (125-25) to the pushrod length for ordering. If the plunger depression is only 1.5 turns, then that would be .075" travel and subtracting the .025" desired preload, I'd add .050" (75-25) to the pushrod length for ordering.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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