He's got problems!!!
 

a buddys 97Z M6 with cc 305 with ported and milled heads, stock valves, LT's, no tune, LT4 km, 1.5:1 rockers, K-motion 800 springs, k-motion valve locks, k-motion retainers, crane lifters.

knocks all the time even when car is warm, killed cylinders (pulled wires, and injectors,) and noise still there it seems to be a valvetrain problem.. falls on it face after 3500 rpms cannot figure out whats wrong with this car.. can anyone help we need ideas on what else to look for.. thanks for the help.

cam installed recently?

Bad cam install or rockers to tight

cam was installed about 3 weeks ago

o yeah?? what do you think went wrong? he said he installed it straight up.

if he lined it up dot to dot and didnt degree it, then he might have not installed it correctly. how much were the heads milled? pray he didnt smack the pistons and valves together

Well I will leave it at "Some" peoples straight up is a little different(by a FEW teeth) then mine ;)

I have seem MANY(over 50) times where the valves are to tight because no one really under stands how to do it.

I would not hold my breath on the not hitting valves on pistons if either of those things have happened Snow Dog ;)