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Am I measuring pushrods wrong?
I'm building a 461 stroker with Speedmaster heads and I need to order pushrods.
I initially used the method where you put a dry erase marker on the end of the valve (thanks Fast Monty's Garage!) and the rocker arm wears the ink off-- I got 9.135" on all valves. Before ordering, I asked Butler to help me make sure I was doing it properly since they're hydraulic roller lifters and there are a lot of opintions out there. The Butler tech said he was certain I would wind up needing 8.800" pushrods and I must have done something wrong. I decided to keep learning and measuring until I got closer to that "known-correct" goal. I thought that maybe the lifters were collapsing? I swapped to the checking springs and did it again. Got the same result. More research, I found this video from Straub that explains the whole goal is to have the rocker arm be square to the valve at 1/2 lift. That makes a ton of sense. I reset everything, drew a line on a rocker, have my checking springs, got it as square as I could by eye, and the pushrod came out to (drumroll please)... 9.135"! Literally the exact same as Monty's video. The Johnson lifters want .035" +/- .010" of preload, so I think I need 9.170". They come in .050" increments so call it 9.150" pushrods. Am I doing something wrong or is the Butler guy just remembering measurements from different lifters/rockers/heads? 461 with 10.230" deck height. Speedmaster 72cc heads, round port. .027" head gaskets Johnson lifters 2112OPR CompCams 1.5 ratio roller rockers CCA-19060 Thanks! |
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