🔍 Accurate Proform 66789 Push Rod Length Checker for 3/8" Studs: Enhance Engine Performance Review

Set my common angle for my 408 shank tappet angle no guessing. I have a complete system of pulleys, yokes and jacks and this tool is essential for perfect alignment.

Excellent tool for quickly checking correct pushrod length and rocker arm geometry when rebuilding the SBC, takes the guesswork out, highly recommend.

tool will fit your rig, but I'm using a retro Howard Cams hydraulic cam and the base wheel is larger than the stock wheel. and if your valve stem height is not up to standard, this tool is not for you. Get an adjustable push rod like the ones Comp Cams makes and sells here on Amazon for about the same money. You will get much better results.

After getting this I realized I can't get accurate measurements with hydraulic jacks on a newly built one that's sitting on the bench. I bought a one piece lifter from Comp but the push rod seat depth was different. Still does not work. So I found that this tool measures the hydraulic stroke about halfway and then subtracts about 0.30 for the preload. As a result I got 0.100/2=0.50-0.30=0.20. Close enough for standard length pushrods. Is it ideal, no. But I don't use roller seesaws either.