That answers my question, WN 1.9 is a carb engine, it looked like that was a fuel injection head in you first photos but the second set confirmed it, head looks ported and used, another daft question, do you know the size of the valves or are they just standard, The engine size 1.921 or 2.144 pistons are the same size, if you removed a spark plug and measured the stroke with a thin rod and turm the engine to confirm capacity 77.4mm = 1.921 and 86.6mm = 2.144, here I go again, re profiled cam and or any lift added, it will be a bucket and shim head.
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