rr installed and now have a miss

bent valve(s)

#1 Buying no-name chinese heads from Tri-State Cylinder Head 9 times out of 10 yields your results, broken parts and a frustrated customer.

#2 When you get to "zero lash" on the base circle of the cam, you ADJUST from that point NOT tighten. The adjustment past that point can vary a little, but usually comes close to 1/2 turn past zero lash. Then tighten your poly locks unless your rocker arm instructions call for a different amount (ie. 1/4 turn, 3/4 turn)

Tightening your poly locks at zero lash on the base circle with no further tightening would have a lot of slop in your rockers, which would mean your roller tips were NOT centered on the tip of the valve stem and you were wearing out your valve guide incredibly quick and putting tons of stress on your valve springs and components.