Dart Iron Eagle Small-Block Ford Blue Oval fans behold the arrival of the Dart Iron Eagle blocks available in 302 and 351 configurations. Once again save the trouble of rebuilding an original, which are getting scarcer than their Bow Tie counterparts. Dart’s SBF Iron Eagle blocks are designed to work with stock components and are cast from high strength iron with extra thick cylinder walls and decks. Steel four-bolt main caps, coated cam bearings, freeze plugs, and dowels are included. Dart blocks are fully CNC machined in-house and ready to assemble with components off the shelf.