[Mustang4SF]

I can feel your pain @kblagron breaking in a flat tapped cam is nerve racking.
I am no expert at all in this field, since i broke in only two flat tapped cams so far. But I listened closely to my engine guy how did hundreds of break ins over the years. Most of the tips and hints above are identical to what I did based on my friends recommendations. I used Maxima Break in oil, drained it, run VR-1 for 150 miles, drained and continue to run VR-1 since then.
The only thing to add is, if you run into an e.g. temperature problem. Shot the engine down and let it cool off completely and continue the next day. You don't need to have the 20 minutes in one run.

Fingers crossed!

 

[Mustang4SF]

That's absolutely not true. You don't heat cycle a cam. You run it 20 minutes. Reinstall the inner springs and run it 20 more. You don't break up the cam break in. You're also better to run the break-in oil for 300 miles. You do NOT keep the same oil and filter on the car after the break-in run. You change both. I also cut my filters open and look for metal particles after the break-in.

As I said, I have limited experience. Of course, changing the oil filter everytime you change oil.So what would you do if the car heavily overheats during the initial 20min break-in? Or develops a bad leak? I am not arguing with you, I just want to know what you would do.