The length of the connecting rod shouldn't have an effect on the number of degrees the crankshaft must rotate to move the piston a certain value.The length of the stroke however has a direct relationship because it determines the radius of the crank pin from the center of the crankshaft journals.In the same book mentioned above by Roy Bacon it shows the stroke of the 500 twin (1949-1958) as 77mm (3.0315 inches).That would make the radius of rotation 1.5157 inches.Using the formula: (R-d)/R = Cos A, where R= radius of rotation, d= drop of the piston below TDC and A= angular rotation of crankshaft, for a piston drop of 1/32" BTDC or ATDC I get the following:(1.5157- .0312)/1.5157 = 1.4845/1.5157 = 0.9794 = Cos A.Using the Cos^-1 function for 0.9794, A = 11.6453 degrees.For the 1958-1963 Meteor Minor the book shows the stroke as 64.5mm or 2.5394 inches.