You bore and stroke any piston internal combustion engine the same way. You replace the crankshaft with one with a longer stroke, or have the stock crank machined to increase its stroke. You also have to bore the cylinders to whatever size you want, within the limits of the cylinders, and use shorter connecting rods and larger pistons that match the diameter of the bore. Then you reassemble with the proper size main bearings and piston rings, and you have an engine with larger displacement.
BORE is 3.740 and the stroke is 3.480
Bore 4.250" Stroke 4.00"
4 inch bore, 3.5 inch stroke.
4.312 bore x 3.50 stroke.
The bore would be 4.310" and the stroke is 4.00"
4.00 bore 3.48 stroke
bore 3.497 stroke 3.81
4 inch bore. 2.87 inch stroke.
bore is the diameter of the piston and stroke is the length the piston moves in the cylinder.for example if bore x stroke is 1x3 then 1 is the diameter of the piston and 3 is the length of the cylinder.if bore is greater than stroke then it is a short stroke engine.
4inch bore 3.25 stroke formula bore x bore times stroke times .7854= cid
3.498 bore with 4.25 stroke
Bore 4.120 Stroke 3.75