Aquaplane alloy cylinder superhead for 100E engine, weight approx 3.5kg. compression ratio is approx 8 to 1.
made to original pattern, substancial internal webbing yet lightweight. finning to top. original Aquaplane part reference AP/2000/S
torque data for tightening cylinder head nuts:
8hp and 10hp -30 to 35 lb./ft.- 40 to 47 Nm
100E - 65 to 70 lb./ft - 88 to 94 Nm
105E/123E - 65 to 70 lb./ft- 88 to 94 Nm