Sorry for taking so long to reply
If you go to this link
Then download the PDF that you access from the link "Ballistinc Motor Timing Information"
On the second page it has in Bold Print - SYSTEM SHOULD NEVER EXCEED 160F which is 70Deg
I guess what I need to know is what is the critical temperature as it varies from motor to motor as you know and the reason I have changed to Novak is because it can handle extra heat - whereas copmpared to some others where through personal experience have gone through 3 (same brand) motors in the space of 2 weeks because they could not handle anything in excess of 65deg - It is almost summer in Australia and dont want to experience that again but would love to increase my boost which I assume will take the temp of 75-80DEG