Hi dbane261 . . .
Serious is a matter of perspective. The issue is potential fuel starvation in the center most cylinders.
The stock single manifold is designed with a hot spot right at the base of the carb. This tends to fill the log manifold with a good fuel air mixture. Yet, even with this design the spark plugs from the outer cylinders can read leaner then then center ones (by coloration) depending on tuning/jetting, operating temperature, weather etc.
Herein lies the potential problem with two carbs on something like an Offy trip. It is designed to have a carb base above each exit from the log into the head - effectively a dedicated one barrel carb per intake port - with the log providing just balance. Plugging the center carb inlet could cause the center cylinders to run lean - especially when cold.
I agree with 41 Coupe: talk to Tom Langdon about the setup you have in mind. If a 3rd carb is really needed he's got them.
regards,
stock49
