Wow! 8400 rpm?!? That doesn't mess up his accesories or anything? I wondered, because of us having big turbos, if an extremely high rev limit is advisable. Did he replace the valve springs? Some use the stock ones, but would they hold up to that high an RPM? I don't know about the Hp being unusable with 272/272 cams, though. Figure that with the stock twins, the boost doesn't hit hard till 4000 rpm. That leaves 2800 to play with. Now say you have a T-78. The boost won't hit hard until about 4500 rpm, and say with a rev limit of 8000 rpm, you have 3500 rpm to play with. Just another perspctive, I guess.
Eric
T-78, 500 rwhp w/stock fuel and 152500 miles? Now that's a goal.