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To create the larger 525 ci, we combined the 4.500-inch bore with a Lunati 4.125-inch Pro Blower series crankshaft. These 4340 certified steel crankshafts are stout, featuring dual keyways, your choice of 1/2- or 7/16-inch drilled flanged, and 7/8-inch lightening holes in the number 2, 3, and 4 rod journals. And if you didn’t already know, Lunati offers a choice of 4.000- , 4.125-, 4.250-, and 4.500-inch stroke crankshafts off the shelf and ready to go. We should also point out, if you’re looking to do a complete custom built-to-order program, Lunati offers an impressive short turnaround time of four to six weeks from the initial order; that’s starting from scratch!