Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededPCE286.1058.01 GM LS 6.0L Gen IV B-4.000 M-STD DH-9.240 6-Bolt Billet Main Iron Engine Block
Ships on 10/28/2026
Lowest Price GuaranteeSpeedmaster PCE286.1058.01 Features:
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.
- Cast from premium high-strength Class 32B iron
- Standard deck height allows the use of off the shelf parts
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Superior Engine Block Construction
Speedmaster Aluminum and Cast Iron Engine Blocks are ideal for street or all-out racing use and styled with an OEM look that works with stock components. With the original water jacket design in place, Speedmaster re-engineered the blocks with extra-thick cylinder walls and decks, super-strong webs, and billet steel 4-bolt main caps to eliminate common factory flaws. Each high-density engine block has enlarged bosses for offset or oversize lifters and is well suited for any 1500+ HP supercharged, turbocharged, or nitrous application.
Show More
Build stronger, lighter, and more dependable power with Speedmaster Engine Blocks—meticulously engineered for high-performance applications. Machined from high-strength aluminum alloy, these blocks offer significant weight savings over traditional cast iron while delivering the structural integrity needed for serious horsepower and torque builds.
For Chevy enthusiasts, the speedmaster sbc block provides a robust foundation featuring four-bolt billet main caps, standard deck height, and options for both 4.000" and 4.125" bores—perfect for maximizing versatility and durability in small-block Chevy projects.
Beyond Chevy, the speedmaster engine blocks line includes Ford and LS options. Each variant is prepared for high-performance use, with billet main caps designed to support elevated power levels and withstand demanding conditions.
These speedmaster engine blocks are not only engineered for strength but also refined for practicality. The precision pre-machining makes them ready to accept off-the-shelf components like camshafts, oil pumps, timing chains, motor mounts, and more—eliminating costly blueprinting or modifications.
Whether you’re chasing peak performance or dependability, choosing a speedmaster block ensures you’re building on a platform engineered for endurance, precision, and adaptability. Ideal for street/strip performance, race builds, or high-output restorations, these blocks offer exceptional value and power potential in one sophisticated package.
