ok well i just put back together my friend motor in his car with no cams i turned it over to make sure compression in all chaambers all good,then put the cams back on well shit turn it to topdead then start turning the cam it will not turn,im woundering how the hell this can be its a b18b bottomend and b18b head with stock cams,well im woundering over and over THE intake valves are hitting the pistons im like how can this be on stock parts.then go and get his paperwork((from napa""not on florida""))THE HEAD HAS BEEN MILLED .052 half a damn millometer so i start loosening all the rockers all the way to the top now it turns with ease..? is how much play is to much with the ls rocker arms movement wise??????