Big M Sportsman Iron Big-Blocks
Main Cap Material: Iron
Dart engineered the Big M to be the strongest, most reliable, and easiest to build big-block on the market. The 4 bolt splayed caps available, in ductile iron and steel, and the thick main webs make the bottom end the Strongest in the Industry. We redesigned the lubrication system to create a true priority main system that oils all of the main bearings before the lifters for extra reliability. Our stepped main oil gallery (9/16 to 1/2 to 7/16) increases the flow of oil to the crank at high rpm, and our front oil crossover eliminates internal oil leaks around the distributor shaft. The result: more oil at the bearings and pushrods where its needed, and less power-robbing crankcase windage. We added two slotted head stud bosses on both sides of the lifter valley so you can use studs instead of hard-to-install bolts to take the place of the missing head bolts.
Dart machines Big M blocks in-house on precision CNC equipment to ensure quality and to eliminate the need for expensive blueprinting.
Please note that Dart Sportsman Blocks do not include freeze plugs, coated cam bearings, and dowels. |
