Ralph, thanks for input.

Maybe within a certain range on our model engines venturi size has little impact on performance. Certainly on cars/motorcycles a larger bore = more power and degraded low end performance. I have a Webra 61 Blackhead, and its carb bore looks to be about 8 mm, same as a Mark (Moki) 61 long stroke. I'm just surprised the Como 40 I have ran as good as it did with that 9mm carb.

I have to tell you how much I lusted after one of your P-51s. I never thought I was pilot enough to handle one, so I never got a chance to own one. Are you or is anyone else still making up the kits of the fuselages?

Jim