Mike, I have the same thoughts. A little insurance now makes sense, vice redoing the motor later. Interestingly enough, I've spoken to 2 different, reputible machinist and engine builders, who both have stated that the lifters I have would be fine. David Butler also stated that due to what they've seen with today's oils, he would recommend running the all lifters I have (already broken in to the cam) then put new lifters on it. I must say I've been torn on this issue for the past several days. I hate spending money where its not needed, and I'd be interested to see if the lifters I have will work, but on the other hand, the risk if they do not is expensive. Although it sounds like I could have the same result by trying to use new lifters with an old cam, even if I do the proper break in.....I hate these types of issues.