The following pictures show the only 350CC British Anzani cast iron engine block known that Bill Tenney prepared for B Alky racing (where Anzani was restricted to 322CC) but it is doubtfull it was ever run as like the pistons the finished bore was finish honed but there is no sign the engine block was ever started and run. Just smoked a bit from the garage fire.
The difference in bore size from 322CC to the full 350CC would be likened to having a large glass of wine was the 322CC with the full bottle being the 350CC which. The full 350CC was commonly used in UK as the B Stock Gas class engine. There is a story of some sort why Anzani was restricted to 322CC and not the full 350CC for North American B Alky but I have never heard it. With little doubt the engine going more over square with the large 350CC bore would have been something worse to contend with than the already remarkable 322CC bore B Alky engines used. The 322CC's track record in the late 1950s and early 1960s was very impressive for the loop technology it introduced into outboard racing starting the Loop Charged outboard racing engine revolution.
This engine pictured is fitted with "West Coast" (center of head supported with struts putting the load in the middle of the block) type pipes used in Washington, Oregon, Montana States in the USA as well as in Alberta, Canada. Some in the later years termed them "Pacman" pipes due exhaust systems overall shape. The fuel induction system is longer ram using a Walboro Alky conversion self pumping carb with velocity stack. The tiny flywheel is minimal for just a rope plate and having a crankshaft to magneto timing gear platform relying on engine torque being stored on the heavy main section of the crankshaft that weighs in nearly the same as a stock Anzani chromed flywheel would, normally a very heavy assembly.
Enjoy the pictures.
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