Mahle MS Piston Set Duramax 4.075in Bore 3.898in Stk 6.417in Rod 1.358 Pin -40.7cc 16.8 CR Set of 8

This Mahle MS Piston Set is designed for GM 6.6L Duramax diesel engines, specifically for the 407 cubic inch displacement. When you open the box, you'll find a complete set of eight pistons, ready to be installed in your engine rebuild. These aren't just any pistons; they're built with performance in mind, featuring a 4.075-inch bore and a -40.7cc dish volume, contributing to a 16.8:1 compression ratio. This specific configuration is often chosen by builders looking to optimize their Duramax for more demanding applications where increased power and efficiency are key goals.

Mahle has a long-standing reputation for well-built engine components, and this piston set reflects that. They are cast performance pistons, meaning they offer a strong balance of durability and weight savings, crucial for high-performance diesel engines that experience significant stress. The pistons measure 3.898 inches in stroke and are designed to work with a 6.417-inch connecting rod and a 1.358-inch pin. Each piston weighs approximately 880 grams, which is a notable figure for cast pistons and indicates a solid construction without being excessively heavy. This attention to detail in material and design helps ensure reliable operation and longevity, even under increased cylinder pressures.

When undertaking a Duramax engine build, especially one involving a piston replacement, it's important to consider the overall engine strategy. These pistons are a significant component for anyone looking to enhance their diesel's capabilities. Please note that this piston set is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's detailed installation instructions and consult with a professional mechanic to ensure proper fitment and assembly for your specific engine build.