Chevy LS 6.0L Gen IV B-4.000 M-STD DH-9.240 6-Bolt Billet Main Iron Engine Block Speedmaster has already done the

Speedmaster has already done the work for you

They are for small and big block Chevys

Nitrous/injector bosses

Their durable finish cleans up easily to provide lasting good looks under your hood

CNC-machined from high-tensile billet steel for strength and precision

Chevy LS 6.0L Gen IV B-4.000 M-STD DH-9.240 6-Bolt Billet Main Iron Engine Block Speedmaster has already done theThe 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.