i've buy a stage 1 skunk2 camshafts set with valve springs exhaust cam gear timing chain tensionner is as been mecanical installed and when the car is running at is normal temperature at 1500 2000 rpm there is a grinding sound that seems to come from the intake camgear (vtc pulley) as anyone ever see that problem. the car is running with k-pro skunk 2 exhaust dc sports header fujita cold air intake.