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Chuck--I never actually realized before this week, how much simpler an overhead valve engine is to fabricate when compared to a side valve. I would have vigorously argued with that because of the added complexity of pushrods, rocker arms, etcetera, until I started trying to come up with a side valve engine that lends itself to easy fabrication.---Brian
OHV allows you to separate most of the difficult bits into separate jobs. My neighbour keeps asking me why I didn't start with a 2 stroke engine as it is simpler, but I would rather make a simple cylinder and liner, then a cylinder head, then some valve gear, then a camshaft and gears. Each bit is on it's own and can be remade as desired. Once you have made a 2 stroke port too big you start again with a new liner