Originally Posted by 008-Racer

Hi I have run the MMM 17.5 and 13.5 with my GM 75 tonight for the 1st time

I couldn't seem to get them both below 90c!

17.5 set at about 15 Deg on the can and geared at 4.7-5 and a mild speedo setting

13.5 set and 11 Deg on can and geared at 5.4 again with a mild profile

Anyone got any gearing suggestions and speedo settings for the GM?

Many Thanks