A bit more than 2k miles on a freshly built high compression ea81. From the get-go I had some valvetrain noise, a bit more than stock. Very solid "sewing machine" with intermittent ticking at idle, from one lifter regardless of oil/engine temp.
Much of this chatter I attributed to the hydro valves, and figured it would work itself out. Kicking myself now, I didnt tear them down for cleaning. They all felt good, so I simply hosed them down with fresh oil and installed them into the new motor. 2k miles later the noises are still there. I do believe I have at least one lazy lifter. But the rest of the valvetrain noise Im wondering about.
All valve lash has been adjusted, and readjusted, and readjusted. Noise never changes. The heads were decked .015 So Im considering the possibility of improper rocker arm geometry. .015 isnt much, so I didnt think of it during the build. All hardware was reinstalled without measurements. All I did was loosen all the adjusters, and do I baseline hydro lifter valve adjustment. Currently running 1 turn from "zero lash".
pretty long-winded I know, but for those with shaved/decked heads, have you noticed additional valve train noise? If so, have you done anything to address it? or just run it?
BTW, the motor runs out great without any odd noises at revs. Valve train noises are only apparent at idle. Slightly noisier at hot idle.
Edited by Idasho, 13 January 2013 - 08:04 PM.