Scat Crankshafts for the Ford 351C and aftermarket block are available as 3.500, 3.750, 3.850, 4.000. 4.100, or 4.250 stroke models. They are each offered in either an Internal or External balance design and come in Standard Weight, Pros Series Lightweight, or Superlight series crankshafts. Cubic inch displacements range from 351 to 454.