Originally Posted by
bigmatt
dynamite 086, you still have a way to go breaking it in.
+1 on the 086, especially on a big track - top end to burn
Leave the shims like that for another .5 gallon and try the O'Donnell 97T plug on the 30%. The GX and MG motors really seem to like the 97T's especially on 30%, where a medium plug is good with the higher nitro content.
The only other pipe I would look at is the GO 2072. I find I get better economy with the 086 though, and a little more bottom end response too.