440 Crank in a 383

((Bore² x π / 4) x Stroke) x 8

(4.250² x 3.1416 / 4 ) x 3.750 x 8 = 425.59 and that rounds up to 426 inches cubed.

Volume of a cylinder times the number of cylinder (for the newbies)

((Bore² x π / 4) x Stroke) x 8

(4.250² x 3.1416 / 4 ) x 3.750 x 8 = 425.59 and that rounds up to 426 inches cubed.