A Honda 750 4 Cyl. motorcycle engine.
Thread here; http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3589369/Re:_My_Honda_750_project#Post3589369
Thread here; http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3589369/Re:_My_Honda_750_project#Post3589369