I inadvertently loosened a screw-in rocker stud (#1 exhaust) while adjusting valve lash.
After running for a few minutes then shutting down because of the racket, I pulled the valve cover to see what the heck was up. The stud had pulled out of the head maybe a 1/2". Lots of coolant was seeping up through the rocker stud bore, and had contaminated the oil. When I pulled the stud, coolant really came out for a couple of minutes.
I know, I know, I have a problem. Besides the fact that the valve train was noisy, I could hear knocking (first I thought my timing was off but that wasn't it), my exhaust valve was probably getting the crap beat out of it, is it "normal" that the rocker stud bore be open to the coolant passages?
My first reaction is to change the oil, coat the studs with red Loctite and torque them all down properly (50 ft lbs)?, then re-install the lifters and re-adjust lash. After getting it running again, do a compression test to see if the valves or valve seating were affected. And hope that all is well.
Or should I pull the head(s) before causing further damage?
Sigh. I hope you all have a nice time at the All-Chevy show...