Is your engine on a bench or stand (I'm assuming it's out of the truck)?
You could just loosen the rocker assembly bolts and slip the push rods out... but as mentioned, label each push rod to insure it goes back to the same location.
You could lift the rocker assembly off and set it aside (I would do that to give me more working room on th engine). Bear in mind, it is two sections so when you remove it, keep it together while you find a place to set it till reassembly.
Likewise, if you have the side cover off and are rotating the engine around with the pushrods removed, I'd also remove the lifters and label them as well. They could fall out otherwise and you might not know which hole they came from.
When you're finished replacing the piston and are ready for reassembly, you put the lifters back in the right hole, push rods in the right spots and reinstall your rocker assembly.
In my mind, you shouldn't have to re-adjust the lifters again.
2 cents worth... good luck, buddy.
Jerry
