The next level of performance are these cast-iron Chevy LS blocks. Designed to look standard under your bonnet, and work with stock components. The Speedmaster block is ready for the street racer or all-out racer with added strength and cubic inches. All the factory flaws redesigned to be eliminated, while still using the water jacket design. The Speedmaster blocks are cast from high-density iron with extra-thick cylinder walls and decks.
