1717 motor will run safe on 7s or 8s?

Castle says on website it's a 6s motor max... but i see people runing 8s on them...don't know if they only do one pass.

I just want to empty the pack and motor stays warm at the end or just normal HOT to be safe using either 7s or 8s.

Can it take 7s runing a full pack on grass with a truggy 1/8?