As with any engine build, cam change, valvetrain upgrade, etc., most folks run fresh oil & filter during the break-in period, and then change it and go back to regular service intervals, we all know that. So you're already buying twice as much oil and two filters...so what's the harm in spending a few bucks more for real break-in oil, and having a little peace of mind? No matter what anyone else says, to me, it's not worth the risk of wiping a cam lobe or spinning a main because I was too cheap to spend an extra $2 a quart for real break-in oil. For the average small block with 5qts, that's only $10 extra bucks. $10 for peace of mind = priceless.