Chevy LS 6.0L Gen IV B-4.000 M-STD DH-9.240 6-Bolt Billet Main Iron Engine Block Speedmaster LS-series cylinder heads are

Speedmaster LS-series cylinder heads are rapidly expanding

Nitrous/injector bosses

Speedmaster has already done the work for you

filter element

Chevy LS 6.0L Gen IV B-4.000 M-STD DH-9.240 6-Bolt Billet Main Iron Engine Block Speedmaster LS-series cylinder heads areThe 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.