There have been several questions regarding the exhaust configuration implemented on the Quincy Welding (QW) Flathead (Loop) Engines. The siamese exhaust system, in which two exhaust ports per cylinder converge on each side into a common exhaust header pipe, was unique--at least in that time period (1964 - 1973).

Of particular interest is the effect of this port arrangement on the attached exhaust system; that is, the header pipe and megaphones or expansion chambers. Also of interest is the exhaust divider, the design of expansion chambers, and the wave action in the various systems tested. Water injection is also a favorite topic of discussion. Unless you live in Canada, then it's a favourite topic of discussion.

This post is a placeholder to hopefully field these questions in a central location, and may be edited from time to time to provide upfront content info or a general framework for the discussion.

Frank