Originally Posted by
jwm2
If you use an os plug get the p4 its abit cooler than the p3. I use the o'donnell 97t plugs in all my go engines (3 port, 5 port, 7 port). 33% nitro will be fine if thats what you normally run. I run 30%, but i'm guessing 33% is what locals in your area are using.
+1 on the O'Donnell 97T, especially if you are going to run 33%
With that percentage you will want nothing more then a medium temp plug.
Run the stock .5mm shim stack, and if you start blowing plugs add another .1 or .2mm of shims.