![]() ![]() Keith Black Racing Engines has now taken it a level further by upgrading the cap material from ductile iron to 4340 billet steel. In the HEMI world, it’s well understood and accepted that the KB block has the toughest bottom-end in the business. ![]() Overall aluminum is lighter and runs cooler.Ĭap walk is often a problem on RB/HEMI blocks when pushed to the limit, leading to oil pressure loss and catastrophic engine failure. Cometic has worked with Keith Black Racing Engines to design KB-specific head gaskets. This eliminates common head gasket water leaks that occur with other designs and provides for extra cooling around exhaust ports and reduces air pockets. The steam holes are relocated outboard, farther away from the cylinder sleeves. KB Hemi blocks also feature a revised steam hole pattern. With modern technology, we can hold extremely tight tolerances that all but eliminates core shift,” a problem that has plagued engine block manufacturers in the HEMI and Wedge for decades. Rob Smith from Wolverine Bronze in Roseville, Michigan explains, “low-pressure casting creates a superior microstructure leading to improved mechanical and thermodynamic properties, higher densification and superior grain structure. They often rely on welded water jackets and have yet to prove themselves in street applications where consistent cooling system operation is essential across a great number of heat cycles. While billet aluminum engine blocks may be de rigueur, they are expensive. ![]() Keith Black Racing Engines has completely retooled and now manufactures the only low-pressure-cast aluminum HEMI and Wedge block available in the market.Īll Keith Black HEMI and Wedge engine blocks start as the same casting, and the final configuration is decided by precision-machining to a finished HEMI or Wedge, Street, or Race block part number.Ī356 T6 is the best overall performing aluminum and has the best properties for managing heat transfer and load, with 300% greater thermal conductivity than cast iron. Modern Casting, an Enhanced Block, and Myths About Cast Aluminum Shortly after the introduction of the KB HEMI engine block in the early ‘70s, it went on to hold every national record in Top Fuel between 19. ![]()
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