Just had a machine shop do a valve job and replace the guides on my 292.

Put it back together, adjusted the valves and started it right up.



I had it idling for about five minutes while I fine tuned things ( timing and the idle )

Got it running really good then gave it a quick rev and then it started knocking.



Pulled the valve covers and one of the intake valves was stuck and the push rod was clanging around...



After just having the guides replaced why would this happen?





Thanks

Corona, Ca.