The question that it seems is being ignored is the concern about pulley speeds. Yes, the larger diameter crankshaft pulley will spin the water pump faster. There are a couple of methods of dealing with the problem. First, and most difficult, will be pressing the 216 pulley off the water pump shaft and replacing it with a larger diameter 235 pulley. It's a hydraulic press operation on and off, not a BFH procedure. The mechanical seal in the water pump simply will not tolerate any hammering. There might also be a concern about shaft diameters, requiring the pulley or the fan hub for a bolt-on pulley to be machined to the correct press-fit diameter for the 216 water pump shaft.
A simpler method to prevent pump impeller cavitation is an old trick the round track racers used to use on flathead Ford V8 water pumps. Grind the pump impeller vanes to about half their normal height, or simply remove every other impeller vane. This reduces the volume the pump tries to flow, and prevents the coolant from boiling inside the pump from vacuum created by the higher impeller speed. It was a common problem we dealt with on the round track engines that were turning a couple of thousand RPM faster than old Henry designed his engines to run.
Using an alternator instead of a generator solves the other problem- - - -generator windings being thrown out of the armature due to overspeeding the generator. Alternators turn at much higher speeds than generators without any damage to the rotor windings.
Jerry
