TSP 427 C.I.D. LS7/LSx Rotating Assembly

Texas Speed & Performance 427ci LS Rotating Assembly

The Texas Speed & Performance 427ci Rotating Assembly is designed for customers looking to step up in cubic inches while maintaining strong street manners and broad power delivery. Built around a 4.000″ stroke crankshaft and 4.125″+ bore configuration, this combination delivers excellent torque and horsepower without sacrificing drivability.

This setup is a proven choice for high-performance street builds and aggressive naturally aspirated combinations, while still offering the strength needed for boosted applications when properly configured.

Key Features:

• 4.000″ stroke crankshaft: Increases displacement while maintaining favorable piston speed and durability.
• 4.125″+ bore compatibility: Designed for LS3-style and aftermarket blocks with larger bore sizes.
• Balanced rotating assembly: Matched components for smooth operation and long-term reliability.
• Strong powerband: Excellent torque and horsepower across a wide RPM range.

Configuration Options:

This rotating assembly can be configured with a variety of component upgrades to match your build goals. Options may include upgraded crankshaft materials, different connecting rod designs, and piston configurations based on intended horsepower levels and usage.

Common Applications:

• LS3-based builds
• High-performance street engines
• Naturally aspirated performance builds
• Boosted street/strip combinations

Important Notes:

• Requires 4.125″ or larger bore block: Not compatible with standard 4.000″ bore LS blocks.
• Professional assembly recommended: Proper clearancing, measuring, and installation are critical.
• Final specifications may vary: Components may differ based on selected options and availability.
• Image is for reference only: Actual parts may vary.

If you’re looking for a balanced combination of displacement, power, and drivability, the 427ci rotating assembly is one of the most versatile LS builds available. Our team can help spec the perfect setup for your application.