5. Lunati supplied the Pro Series BB421KN forged steel crankshaft. This crank features a 4.375-inch stroke, and standard 2.750-inch main and 2.200-inch rod journals. The crank was balanced at Paul Pfaff Racing using bobweight data specified by DNE. If you look closely, you'll notice that the there are two oil pan bolt patterns drilled in the rail, and one of them has been plugged. This is because we picked up an oil pan that was originally destined for a Donovan C-500 block for a song and had to drill that pattern into our block in order for the pan to work. We got a great deal on the pan, so the extra labor was worth it.