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Milling cylinder heads with an offset spark plug

Another one nice fabrication by Spyros(GR) aka Bismarck. This billet aluminum ring on top of the Nsr250 cylinder head allows for precise mounting on a lathe hence machining work is possible. 
Original inspiration taken out of Winton's Nsr250 blog, check out the related link at edetuckracing, setting the squish.

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