BC0452-UPG – Chevrolet LS7 Dry Sump Stroker Kit – 4.000″ Stroke/ProH625+ Rods, CP Custom MTO Pistons

For the serious builder targeting the absolute pinnacle of naturally aspirated LS performance, the BC0452-UPG Chevrolet LS7 Dry Sump Stroker Kit represents a calculated and uncompromising engineering solution. This isn’t a collection of catalog parts; it is a purpose-built, balanced rotating assembly designed to transform the legendary LS7 7.0L into a monstrous displacement powerhouse while retaining its high-rpm, dry-sump heritage. Brian Crower’s expertise in valvetrain and rotating mass is channeled here into a kit that redefines the limits of the LS7 architecture, pairing a massive 4.000-inch stroke with premium ProH625+ connecting rods and custom-spec CP pistons to create a foundation capable of supporting over 700+ horsepower in NA trim and immense power levels under boost. This is the definitive upgrade for Corvette Z06, C6.R, and fifth-gen Camaro Z/28 engines where maximum cubic inches and absolute reliability under extreme load are non-negotiable.

Technical Breakdown: The Anatomy of a Maximum-Displacement LS7

The LS7 engine, with its factory 4.125″ bore and titanium connecting rods, is already a masterpiece of production performance. The BC0452-UPG kit methodically advances every critical component to achieve a staggering displacement increase. The cornerstone is the 4340 forged steel crankshaft, which extends the stroke from the factory 4.000″ to a ground-pounding 4.000″. While maintaining a standard stroke length in name, the combination with aftermarket bore sizes (typically 4.130″-4.185″) yields a final displacement of approximately 427-434 cubic inches (7.0L-7.1L), providing a monumental increase in torque and horsepower potential across the entire rev range. This crank is precision-machined, micro-polished, and Magnaflux inspected for structural integrity, with chamfered oil holes for superior lubrication under high-RPM, high-load conditions.

ProH625+ Connecting Rods: The Critical Link

Supporting this increased stroke is a set of Brian Crower’s flagship ProH625+ 4340 forged steel connecting rods. These are not mere substitutes for the factory titanium rods; they are an upgrade designed for ultimate strength in severe duty applications. The “H625” designation refers to the material’s tensile strength (625,000 PSI), which surpasses that of standard 4340 forgings. Featuring ARP 2000 cap screws as standard (with 625+ custom-age fasteners available), a precise fracture-cap design for perfect big-end alignment, and shot-peened and stress-relieved surfaces, these rods are engineered to withstand the punishing cylinder pressures generated by a high-compression, large-displacement stroker or forced induction. Their robust design provides a significant safety margin over factory components, especially in high-RPM, high-horsepower environments where connecting rod failure is catastrophic.

CP Custom MTO Pistons: Precision Combustion Control

Completing the rotating trio are the CP Custom MTO (Made-To-Order) forged pistons. This is where the kit transitions from a powerful assembly to a tailored engine solution. CP pistons are CNC-machined from 2618 aluminum forgings, a material chosen for its superior ductility and fatigue resistance under extreme heat and pressure compared to 4032 alloy. The “MTO” specification means these pistons are configured to your exact requirements: target compression ratio (typically between 11.5:1 to 12.5:1 for NA builds), desired ring pack (including modern low-tension oil rings for reduced friction), valve reliefs cut for your specific camshaft lift and cylinder head combination, and pin diameter matched to the ProH625+ rods. Each piston is weight-matched to within one gram, ensuring perfect harmonic balance in the completed assembly. The inclusion of CP’s proprietary “MaxxSpeed” skirt coating reduces friction, while the anodized crown improves thermal management—critical details for a performance stroker motor.

System Integration & Dry Sump Compatibility

A key differentiator of this kit is its explicit design for dry sump oiling systems. The LS7 was born with a dry sump, and maintaining this system is essential for sustained high-RPM operation, extreme cornering forces, and optimal oil control in a high-performance street or track application. The BC0452-UPG kit ensures full compatibility. The crankshaft is configured for the factory-style dual-plane crankshaft sprocket and includes provisions for the front oil pump drive. The piston oil squirters in the LS7 block remain fully functional, providing critical under-crown cooling. Builders should note that proper clearance checking of the stroker assembly within the block, particularly at the camshaft and cylinder walls, is mandatory. For an in-depth technical analysis of dry sump advantages in high-performance LS engines, refer to this authoritative resource from Motor State Distributing.

• Massive Displacement Gain: Achieves approximately 427-434+ cubic inches, unlocking unmatched naturally aspirated torque and horsepower.
• Uncompromising Component Strength: 4340 forged crank, 625+ tensile strength rods, and 2618 forged pistons create an assembly rated for 1000+ HP.
• Tailored Engineering: CP Custom MTO pistons allow precise specification of compression, ring pack, and valve reliefs for your exact build.
• Dry Sump Optimized: Designed from the ground up to integrate seamlessly with factory and aftermarket LS7 dry sump systems.
• Premium Balance & Finish: Fully balanced rotating assembly, with micro-polished crank journals and weight-matched pistons for smooth, high-RPM operation.

Vehicle Fitment & Application Notes

Primary Vehicle Fitment: This kit is engineered specifically for the Gen IV Chevrolet LS7 engine (RPO code LS7). Its primary applications are:

2006-2013 Chevrolet Corvette Z06

2014-2015 Chevrolet Corvette Z06 (Export Models with LS7)

2015 Chevrolet Camaro Z/28

Various C6.R and LS7-based race engines

Compatibility: The kit is designed for use with factory LS7 cylinder blocks. For use in aftermarket or LSX blocks, specific clearancing and piston configuration may be required—consult with your machine shop. It is compatible with both factory and aftermarket LS7 dry sump systems. Critical Installation Note: Installing a stroker kit of this magnitude is not a bolt-on procedure. Professional machining (bore/hone, decking, align-honing), meticulous clearancing checks (rod-to-cam, piston-to-valve, piston-to-deck, piston-to-cylinder wall), and assembly by a qualified engine builder are absolutely mandatory to ensure reliability and performance.

Technical Specifications Table