RE: 8ight-t and the Mach 427
I would go with what savage said, I fully admit the mach is not a engine i know much about. For break in it probably is to high, you can try riching everything out and see if that cools it off but for regular running when your going mostly WOT I would say it might be whats to be expected. Though honestly a lot of people on here seem to suggest like 200 or 225 for break. When it comes to break in there are more theories than people I think.