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...