Originally Posted by
Frank Volker
Frank,
The engine, as shown in your photo, has gen 2 pipes. Most likely, it was originally shipped with gen 1 pipes.
I'm not sure what the other carb tube is for. It's too high for a fuel-level standpipe overflow as the alky engines used.
There should be a water exit hole drilled in each exhaust pipe flange. The hole is drilled from the cylinder side to line up with the upper cylinder water jacket and "aimed" to spray the exit water stream on the pipe at--or just past--the elbow section. Without these holes, the pipe temps will be much too high.
Frank V.
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