Also you mention (in your last post) on spark plug timing. There would seem

to be some consensus (on ACRE) that for our application that the firing of
the plugs at the same time has no adverse effect - what's your take on this.
George (down under)

George, I have been researching this carefully. The reason is that since 
I'm running a 20B, the ignition/injection I would have
to buy to run a "rotary split" is very expensive. Tracy's will run 
a 20B but not with split timing. (Correct me if I'm wrong
Tracy)

The advice that I have received from all those asked basically 
boils down to this. If you are tuning for horsepower same time
firing is fine. Most say you won't notice a difference. There 
are a few that are trustworthy who say that running a split will
lower temperatures slightly. This is the only reason I'm even 
bothering to follow up on this. Since heat rejection is one of our
tougher problems I want to know if there is anything to this.
Bill Jepson

 
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