Gentlemen,
I was cruising along in my '79 c-10, 250, bone stock, 160,000 miles on the motor. Gave it a little punch from a stop sign and suddenly got this very, very loud push rod, rocker arm kinda noise. I mean it sounded like something smacking the inside of the valve cover. Oil pressure stayed up, 45 lbs., temp stayed at about 175 F. But the noise is terrible. I pulled the valve cover and found no excessively loose rocker arms. I readjusted the valve lash and fired it up and it sounded OK until I really revved the motor and the noise came back. Could this be a collapsed lifter? I am certain that it is not a rod knock. Any help would be appreciated.
Thanks.
Ken
