The cam came with instructions that said not pre-load the lifters as it could damage the cam during initial break-in, I have run it and adjusted the lifters a couple of times now and still sounds awful. I drove it to work and back yesterday and it ran fine just noisy from the lifters, work and back is about 60 miles round trip. I adjusted them at work and them again when I got home. I guess it is time to replace them and try again.