Quote Originally Posted by Dave Severson View Post
With all that racing, supercharger, turbo and everything, better just go aftermarket block....the Factory blocks do like to split, plus the aftermarket blocks are 4 bolt mains and a better oiling system....
Let me add to that - see pages 100-101 and/or do a search for "351" : Ford Racing Performance Parts - [2010 Catalog] . It's a .pdf so it does take a few seconds to load. You can also go to the World Engines site: World Products / Bill Mitchell Hardcore Racing products, High Performance and Racing Engines, Short Blocks, Engine Blocks, Cylinder Heads, Intake Manifolds, and Parts for Street, Strip, or Circle Track

To many dollars need to be spent on an OEM block to build anything but a mild street engine out of one (been there, spent it)