I have the 70-2000Kv with 5s on my revo conversion. The 70mm Medusa sits close to the rear upper arm so the 80 might give you some fitment issues. It runs cool. In fact, it runs cooler than my TeknoRC Neu because of the cooling holes in the rear of the motor.
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)