Scanning u tube the other nite, watched this guys vid on proper engine break in. He buys the 10 bucks a quart break in oil for all his engines first fire. And this is what I had never heard. He said MOST all lifters made today are made by one of two companies. He said from his experience with other engine builders also, MOST all cam/lifter failures happen with one brand. And he would not name that company but did say, You want lifters made by the other company , Delfi. Then he showed a lifter with a little black line around the lifter base and said , This is what you want to use.....and held up a Competition Cams box. Not sure if any of what he said is true, or all horse hockey, but he sounded very knowledgeable ......food for thought....