Originally Posted by TrentB
Put your thumb on the pushrods and just keep applying pressure until they drop. Don't worry about anything breaking.
Preload is specific to the lifters you're using. Some use less some use more.
Yeah you add your measurement plus preload and that is your pushrods final length. You're really just tightening down the rocker and measuring the distance from the lifter to the rocker. Then add the distance you want the lifter to be preloaded.
So I checked on a couple different valves I confirmed were closed shut...
Snug down rocker, it had barely any side to side movement and no up and down movement (which is what I should look for according to other threads?) . It took 12 turns to get to that point. After math (each turn on my specific tool is .035) I came up with a 7.22 length.
Now I add my preload which for ls7 lifters is apparently .050 which would make me at 7.272 .... Considering how snug the rocker was when I checked.. just snugged with a ratchet. I still feel like I'm wrong because my previous length I ordered was 7.2 and when the valve was closed the rocker was able to move a lot, although I did not add preload to that length as a mistake. Will that .75 really make a huge difference and stop all that play on final assembly? Do I order a 7.275 or should I go with 7.3 or 7.25? Don't want to get this wrong... thanks..