I am trying to figure out my valve train noise. I have a 340 with a Hughes 1928 cam hydraulic. I used the stock rockers and with the stock push rods and had a lot of lifter noise so they said I probably needed a longer push rod due to the difference of the base circle. I need to figure out how to set the preload. Anyone have some suggestions. When I set them where I think they should be there is no compression, ie valve opened. Thanks in advance. Mike

the adj pushrods are made to get the right length. then you have a set made.

hi
easy way would be with intake off ,not what you wanted to hear !

turn engine till lifter you are working on is on cam base circle adjust pushrod till it just touches the lifter plunger and the rocker arm seat , add 1/2- 34 turn and lock it there !

do all 16 same way .

some newer cam profiles cause lifter noise !!

My video shows you how to adjust valves with the intake still on......

Here's a link to the highlight reel on YouTube........