Check the bottoms of the lifters where they ride on the cam. If you see anything other then a smooth surface, your cam or lifter is bad. The camshaft will have a trail around each lobe where the lifter has been running, they do not touch the whole cam lobe, just a portion of it, thats why i said to look for a trail. At the peak lift point the lifter will touch all the way across. If you have a dial caliper, measure the peak lift points, they all should be real close to each other, if you find a few or even one with less lift, get a new cam.
Don't forget to check the valve stem ends where the rocker arms touch. While there, check each rocker arm for wear at the valve end. Any damage at all, and you will need to change them.
Joe
Last edited by Joe H; 03/15/2010 3:58 PM.
