First of all, let me say that roller cams do not require a break in
oil.
Second of all....I'll never hear anyone say, "I guarantee you that I will not wipe the lobes down with a flat tappet cam on a fresh startup." That's for a reason.
Who wants to go through the rain dance that you have to go through? You're absolutely right Ernie. Builders don't want flat tappet cams because they don't want to take even a remote chance of wiping the lobes down and having to disassemble, clean, reassemble, and try again. When you wipe a lobe down, metal gets scattered through the entire oiling system. Bearings have to be replaced....possibility of scarred crank journals,
oil pickups are full of shavings, pumps, etc. It's a mess.
Let me add that there is NO PERFECT WAY of breaking in a flat tappet camshaft. Drop out the inner springs, use the Joe Gibbs breakin
oil, run 1.2RR rocker arms, make the engine fire on the first crank....you still cannot guarantee that the cam will survive.
Save the hassle, spend the $300-400 and go roller. Gain horsepower. Lose the risk of engine damage. You flat tappet guys just don't have an argument here. If you need the sound that bad, put a baseball card in the wheel spokes.
You may have a bad taste in your mouth from a solid roller....but it's only because you used the wrong lifters....
What if a builder upgraded you to a roller cam for free? Now what argument would you have?