This is a newly built 383 still on the stand. All cylinders show pressure when spinning the crank by hand except #1.. I can hear the it blowing out the exhaust port.. Anything else I could try before pulling the head off? I did remove the exhaust rocker to make sure the valve wasn't being held open. The heads are fairly new Edelbrock RPM's, with the RPM Roller cam. If its a bent valve, Im a bit worried how it got that way. Ideas?