Originally Posted by glhx
Im pretty sure its a stuck lifter. has the sewing machine sound and gets louder with rpm changes.
changing the oil did nothing. engine cleaner did nothing.
i used a tall screwdriver to hear harmonics all over both valve covers and all intake runners. Ive been able to pinpoint these before but cant find this one.
pretty sure its not a rod knocking.
ive checked all over the motor just to see if i can find it.
Check closely for an exhaust header leak...