I knew this was the right Place for help!!!! Awesome!!!

CK1-Ok regarding the tuning, I have done the steps to tune the engine. Even to the point of dead sticki a couple times because too rich or lean. Currently, the engine just purrs at low idle and wants to rip the fire wall off at WOT on the ground. In the air I have had nothing but awesome performance dispute the burble/sputter. I beleive the manual advance in question is- the white ring with the push rod? I wOuld not know. How to effect change with timing.

closetguy, the cowl doesn't have a lot of outlet for air to pass thru. Not horrible. But a typical radial cowel installation. A little space on the sides by design and a 1/4 or slightly larger gap around the head as it protrudes a bit. Will try this too.

Stuka Larry I will try the stack. Does the end of the stack need to protrude past the cowl or is it ok inside?

W8ye, his was my initial thought. It is an expensive prospect for trial and error. Currently running a master airscrew 25 x 6/10. I like these props performance for the buck seems to be a nice balance (just bought a biela for my hellcat and felt a tad dirty by paying its price). It seems to do awesome for this engine and airframe set up. Make sense to prop up or down? Too much rpm change with the variable pitch prop on throttle transition?

Thanks again for your time.
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