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Message: <blockquote data-quote="50HSN95" data-source="post: 1458463" data-attributes="member: 22772">Were the lifters new? Also stock stamped rockers or aftermarket that were in the motor? I seen you had a spare stock set but not sure what was in the motor. Anytime you are putting a new stick in you should be measuring for push rod length. One never knows if the heads have had material taken off of the surface or what type of machine work they have had. With a new bump stick also (and this is a personal thing) I would look at new lifters as not knowing the age or condition and going with a higher lift cam I just again personally would be replacing them, cheap insurance. Do you know what the seat closed and open pressure is on the springs? Just a few things to look at that may assist in narrowing down the problem. I know the cam has been around forever but as every motor is slightly different, good to look at everything involved to see where the problem may lie.</blockquote>