10. Some engine blocks are wide enough in the crankcase area that you can swap in a longer stroke crankshaft without any issues. That is generally not the case with a small-block Chevy. Going from a stock stroke of 3.48-inch to a 3.75-inch stroke crank from a 400, requires grinding the engine block in certain areas to clear the rotating assembly. Hafliger ground these notches at the bottoms of all the cylinders with a carbide cutting tip. Be careful, here, because there’s a water jacket directly behind this grind area. Plan to mock up the rotating assembly first before final assembly, and don’t forget to check the clearance between the connecting rod, bolt shoulder and the camshaft lobes. Depending on how much lift your cam has and which connecting rods you are using, you may find interference here.