Some detail here from early prototypes and customer engines
Early hi-rise manifold engine fitted with dip stick and rocker covers	Alternator is not in the plans. Again this one has a dip stick and we fiddled with a different manifold twin carbs & air cleaner
Variation with extractors and single carb	Gearbox for effect only air cleaner in plans
Lots of effort went into getting the manifold right and easy to build