Just one cautionary note.
The tachs are not always completely accurate. If you listen to the guy who shifts at 7500 but his reads 500 too high and yours reads 500 too low... You and he are going to have different experiences. There's no substitute for getting to know your own car.
But with that said, these are tough little motors with no serious weak points. I take all of mine to redline routinely and have cruised on the highway for hours above 4000 rpm (easy to do in a short-legged 4-speed).
The tachs are not always completely accurate. If you listen to the guy who shifts at 7500 but his reads 500 too high and yours reads 500 too low... You and he are going to have different experiences. There's no substitute for getting to know your own car.
But with that said, these are tough little motors with no serious weak points. I take all of mine to redline routinely and have cruised on the highway for hours above 4000 rpm (easy to do in a short-legged 4-speed).