The objective of the Alfabeast was to fit the largest engine I could find, into a Harley frame, without increasing the frame cradle, fortunately the engine that fit the bill had good pedigree; coming from an Alfa Romeo and weighing in at 2500 cc with six cylinders. The transmission is a 4-speed Harley unit.
The build
Alfa engine squeezed into the frame, the oil pump needed to be moved outside the engine to provide ground clearance