iamdub
Full Access Member
Your post made me go back and double-check my notes to make sure. Somehow, I got the notion that the factory pushrod length on the L94 is 7.400", but it's 7.385". So my memory was wrong because I used 7.400" pushrods for all 3 of the aftermarket cams I had in there (which at the time I thought was the stock length). I did confirm the correct preload upon install with the adjustable length pushrod checker tool I have. I stand corrected. Thank you.
It seems there's a 50/50 split between them being 7.380" and 7.385". There's also explanations for why there are these two specific measurements: One is the full sphere dimension for the ball tip and then that .005" shorter measurement if you put the caliper over the holes. It's flat there, costing you .0025" on each end. Since the ball tips fits in the cups so that they're the actual contact points, my personal belief is that they should be considered 7.385" since that's the effective length. But, it's such a minute difference when you're dealing with hydraulic lifters that have something like a .040" allowable preload range so I just round it off to 7.380" to make the quick math easier.
Even then, the cylinders vary a lot between the corner ones and those in the middle. I have it documented somewhere in my thread from about a year ago, but I ended up with three different lengths of push rods in mine to get them away from the minimum and maximum preload figures and to tighten the variance across all of them.
*EDIT* I couldn't let it go so I looked it up: https://www.tahoeyukonforum.com/threads/growing-up-doesnt-have-to-suck.93510/post-1669150
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