will my pistons hit my valves

i have a zo6 cam with a 550 lift and want to get 1.8 ratio roller rockers for a avalanche with a 5.3 (that i have a stack of parts for but have not bought the truck yet) any one know if i will have any fitment issues?, i want to get all the parts before the truck and only want to but them once

they should clear with no problems as long the motor is stock with stock gaskets.

Might need valve cover spacers due to the 1.8 rockers.

thanks for the help, this is a killer site!!, yesterday was my first day as a member and didnt expect help so fast.

theres always a few crack heads awake late at night :lol: