help.this is a 1993 touring model evolution motor [stock] I took the lifter housing and cam cover to get it crome,and the heads to sand blust. when I put it back and start the bike it run fine, but after the bike runs for about 10 minutes the bike stared making this solid noise on the cam cover side and if i open the trotter it stops but at idle the noise came back. this is what I have check so far. the oil pressure is 32lbs at 2000 rpm and 20lbs. at idle. took lifter apart and they look o.k. clerance is .003''between housing and lifters. I took the valve covers off and started the bike and notice there was no oil pressure,at the rockers the oil was camming out bery slow no splashing at the valves. can a stickit valve cause this noise?