CMB 67HR Green head

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It's going in a glass turbine hull Mike. I think it's a Hydro & Marine hull.

This motor is new but not sure if it' from a new batch or an older one. Will have to CC the button to know for sure I think. I have a lathe and can adjust if needed...
 
On a muffled pipe isn't the actual stinger inside the muffler section of the pipe? Does reducing the stinger on this type of pipe actually do anything? On a nitro pipe i see the benefit. More back pressure and more heat in engine. I have a AB parabolic that has a little tiny hole down inside, then it flows to the muffler section,. If there any benefit to adding a long stinger or reducing the stinger on something like this.
 
what size AB pipe anthony? on some of the .21's, andy recommended opening up the actual stinger, down inside the muffler.
 

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