I had a lifter stuck collapsed on my 2013 5.3 Gmc sierra. Went on Youtube and watched Crazed performance repair. I did exactly like him, removed the flom, blocked the oil supply to the solenoids and ...

Pick up any camshaft and it's pretty simple to see what it does. It turns, the little bumps come around and move the lifters, which-through the pushrods and rockers-open the valves. The truth is, ...