Howard  Young's  Iron  Ariel  Square  Four   (click on image for larger picture)
  Head and rocker box Fitting coupling gears

AJ with  engine

Engine 

Engine, showing coupling gears Polished engine and crankshafts Inside engine cases and 1 crankshaft Cylinder, followers and push rods
Ported and polished head with oversize valves Rocker Box AJ with partially completed engine Another view of head and valves
Almost completed engine Engine view 2 Engine view 3

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