Moper and 408, I agree that it is better to 'know' the history of the 'used' cam..I must respectfully disagree that used is a 'waste' of money. I have used many 'used' one's over the years. If the cam was properly broken in and you put the lifters on the same lobes you are good to go. If you don't know the history and/or you can't put the lifters in the correct bore/lobe then it is a different issue altogether. Nothing wrong with 'used' as long as it is in good condition..if in doubt..measure. Works for me. Terry.