[Kevin in NJ]

There has been a lot of back and forth on the carbs.

The problem is the huge variation in the rebuilding of the engines. In particular if you think about the very very subtle variations in problems you can get from valve systems being put together.

So to accurately compare the carbs you need to run on engines that are setup properly.

To say that one carb worked better than another on an engine you need to fully qualify by adding every detail on what was done to the engines breathing. Bill with his reground cam off by 1 degree (but does not know it) might find different results from Fred who just put a nice used cam in the engine. I will not even get into understanding valve gap set up adjusted for the types of metals in the valves.

From many years of talking to people and reading on the boards, a properly rebuilt Tilly can work as good as the original Zenith. I personally have seen a lot more Tilly's leaking. The single bolt original is much simpler to deal with when you have a problem. The only problem is you will probably never have a problem with a properly rebuilt original (we shall see what new gas brings us).

The key is properly rebuilt. A properly rebuilt engine, a properly rebuilt carb as it is a system that works together.