So what is the best rpm to shift at for this engine?

 

redline?

 

Excuse my stupidity but what is redline on the 300HP engines? 7100 RPM?

 

7100rpm, yes. i say redline because the new rev-up motors make all their additional power above where the old 287 motors give up, right after 6600rpm. so in order to get the most out of your 300hp rev-up motor you need to take it to redline