I had 2 Comp cams go bad. Each cam lost one lobe each, but different cylinders. The lifter bores are fine. New lifters slide and rotate just fine. The first bad cam was covered under warranty by Summit racing because it was only in the motor 28 days. The second one lasted 4 years. The crappy oil and my ignorance to its effects were to blame. Since the second cam went bad I have read alot about why it happens. My eyes are open now. I love to work on the cars, but I just want this motor to run strong and STAY that way. I only drive the car 1500-1800 miles per year, so I figure that a good combination of parts should last a long, long time.