When I was a kid, I had a 'Visible V8' display, with the block made of clear plastic so you could see all the internal parts moving. Not exactly an Alfa motor, but it will get your point across. I just did a quick Google search, and it came right up: http://www.littleshopofhobbies.com/Educational_Kits_1.htm Regards, Dean '74 & '78 Spiders
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