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Hallo. Cylinder dimensions for Deerhound I in “British Piston Aero-Engines and Their Aircraft” (by Alec Lumsden): Bore: 5.26 in. (135 mm) Stroke: 4.95 in. (127 mm) Swept Volume: 2259.75 cu. in. (38.19 litre) But... 5.26 in. is (circa) 133.6 mm 4.95 in. is 125.73 mm Vol. (circa) 2259 cu.in...