Just finished a top end on my 2002 C-10 (25,000 miles).I replaced the cams for sever pitting; looked like detonation more than just pitting, I Had it running fine excpet it "stuttered" from 1000 to 2000 rpm. I put almost 500 miles on it and decided to check the valve lash again. When tried to start it back up, I noticed what appeared to be clear water droplets coming from the vacuum valve that attaches to the valve cover over cyl's 1/2. I do not see any gas or water in the oil or contaminates in the coolant. I do not smell coolant and the water droplets appears clear. I checked compression: #1=179, #2=180, #3=190, #4=185 psi. I torqued the head bolts; those nearest the center cylinders were a few ft/lbs loose. re-checked the pressures: #1=183, #2=175, #3=180, #4=175. I realy don't know if these are within spec or if the water vapor/droplets means I have a leaky head gasket or not. Any advise is appreciated. Thanks, Doug