Engines with large stock rod-journal diameters (like Buicks, Oldsmobiles, and Ford 351 Windsors) can achieve fairly decent stroke increases via offset grinding and nonstock rods and pistons.

Companies like Holley sell cranks, rods, and piston combos for nearly any engine. You can increase the stroke on any crank by offset-grinding the rod journal, which moves the journal centerline ...

In the early days, crankshafts were stroked using a method called offset grinding ... With a 4.000-inch stroke crankshaft, the rod ratio is 1.531:1. Most engine builders shy away from rod ratios ...

3.832-inch stroke. How he'd do it, you ask? By machining the rod journal diameters down to the 327 engine's size of 2.00 inches. Thus, affordably offset grinding the journals to save money.

But where do those numbers come from? An engine's displacement is calculated using the diameter of its cylinders and the length of its crankshaft stroke to determine the volume of each cylinder.