Originally Posted by Nacho
I have tried both ways to adjust my valves. Pre-load i have tried 1/2 turn after zero lash and 3/4 turn. lifters are comp cams brand, heads are Camel Hump, retainer to seal I dont know, springs binding (No), Pushrods seem to ride the guide plates little and no shiny spots on valve covers
Check your valvetrain setup up top. I don't know what springs you've got or at what installed height their setup at but it's a very common problem, especially with over .470" lift.
You can also check for interference between the rockers and retainers (doubtful but worth a gander), as well as interference with any oil baffles inside the valve covers.
As a last shot in the dark, did you use the clear di-electric grease inside your spark plug boots?
You get one of those arcing out it will sometimes make a very deceptive sounding "POP"..