The C6 out of the box, is shimmed for up to 25% according to RB.

When I got this motor it had an additional shim installed and the guy was running on 30% fuel.


Next time out, it will be sporting a 5.5mm restrictor, OD 97T plug, a 17T bell as well as .8 clutch springs.
I'm happy with the runtime, just trying to calm it down a bit more for the indoor track I run on.


Once I get it where I want it, it's going on my Son's car and I will go back to running my OS Speed motors.


Scott