Need Help ASAP
They should be able to use a simple adjustable pushrod tool to determine the amount of shim required through a few simple calculations.
Do it the correct way and get the right length pushrods.
There's no way for anyone on this board to give you a correct answer regarding the length b/c we can't measure application. Any competent shop should be able to do this. If not, I'd suggest taking it elsewhere.
Are they saying that the valves never fully seat throughout the rotation of the camshaft's 360 degrees?

