Engine Displacement
cubic inches x 16.39 = liters liters x 61.013 = cubic inches cubic centimeters (cc) x .06102 = cubic inches cubic inches x 16.387 = cubic centimeters (cc) bore x bore x stroke x .7854 = cubic inch displacement per cyl.
Measurements
inches x 25.4 = mm mm x .03937 = inches metric tap drill size = tap diameter  pitch
