Steven Sun Performance LS Aluminum Block

The Ultimate Foundation for Extreme LS Builds

When you are pushing the limits of modern LS performance, the foundation of your engine is everything. Available now through Proformance Unlimited, the Steven Sun Performance LS 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.

• No warranty expressed or given

Technical Specifications