should there be presure when the car is at idle (running) when you take off the oil cap on the valve cover ?when i took my cap off and put my hand over the oil cap hole there was presure coming out the reason i askj is because i have this nocking noise coming from that side of the motor im only runing 6psi-7psi i took a screw driver put it up against the block while it was running and listen though the screw diriver to here if there was any noise but everything sounded fine would a aftermaket cam gear make a noise? i dont no what to do i checked everthing all the belts are good its running fine not lean or rich except when im boosting it runs rich from the reading of my a/f gauge under accleration its its rich about 3 bars on the gas. fine? but any how i is there presure when my oil cap is off wtf any ideas

 

any one got any ideas

 

Blow by is generally caused by worn piston rings, worst case scenario broken ring lands or a hole in your piston/s. The knocking may be a rod bearing. Aftermarket cam gears will not cause knocking. Unless installed incorrectly and valves are contacting the pistons. If this was the case you would have heard a more pronounced knock. More like a bang.