Yes, we did back to back X16 to Q16 and picked up almost 30 hp. It takes a little bit of carb work to switch between fuels. BLP set me up with a carb that will switch between 2 circuit for race gas and then 3 circuit for Q16.

I also pulled a little bit of timing out of the motor and that improved things. With less timing the wide bands went leaner and the motor picked up some power. I think I might have had too much timing in it before which might be why the heads got hurt last time.

We're going to try C45 today. The recommendation is more fuel and less timing so I'll follow what VP says and we'll see how it goes.

I also think the cam I have in the engine is too big. We're down a little bit of power from the smaller cam that was in it before. Doesn't really surprise me, at this power level the intake port is probably the choke point and not the valve lift. Valve lift is .890 gross which is probably more than it needs.