Proflow's Extreme LS/LSX Engine Block

When you are pushing the limits of modern LS performance, the foundation of your engine is everything. LS/LXS Aluminum Block is engineered specifically for high-boost, extreme-horsepower applications.

Designed around a robust, upgraded aftermarket Gen III architecture, this lightweight, ultra-strong aluminum package eliminates the weak points of factory blocks. Whether you are building a twin-turbo track monster or a massive-displacement supercharged street car, this block provides the structural rigidity and oiling efficiency needed to keep your rotating assembly alive under extreme stress.

Key Performance Features

• Premium Cast Construction: Cast from high-grade A356 aluminum for an optimal balance of weight savings and raw structural integrity.

• Built for Boost: Comes equipped with extra-thick ductile iron sleeves specifically designed to withstand the intense cylinder pressures of heavy forced induction.

• Bulletproof Bottom End: Features heavy-duty billet main caps to prevent cap walk and secure the crankshaft under extreme loads.

• Priority Main Oiling: Ensures that critical oil pressure is delivered to the main bearings first, protecting your bottom end at high RPMs.

• Massive Power Capability: Conservatively rated by the manufacturer to handle between 700 to 2,000 horsepower.

Technical Specifications