Mahle MS Piston Set GM LS 428ci 4.130in Bore 4in Stk 6.067in Rod .927 Pin -3cc 12.2 CR Set of 8

Mahle is a well-known name in engine components, particularly for their expertise in pistons and rings. This Mahle MS Piston Set is built for GM LS engines, specifically designed for builds aiming for a 428 cubic inch displacement with a 4.130-inch bore and a 4-inch stroke. These pistons are engineered to work with LS7-style heads, offering a 12.2:1 compression ratio with a -3cc dish volume, making them a solid choice for performance-oriented engine builds.

Each piston in this set is constructed from 4032 aluminum, a material chosen for its good balance of strength and thermal expansion properties, which helps prevent piston slap and ensures a good seal. The pistons feature a 4.000-inch stroke compatibility and are designed to work with a 6.067-inch connecting rod and a 0.927-inch wrist pin. The specific dish volume of -3cc, combined with the bore and stroke, results in a notable 12.2:1 compression ratio, suitable for naturally aspirated or forced induction applications where higher compression is desired. Each piston weighs approximately 450 grams, contributing to a well-balanced rotating assembly.

This set includes eight pistons, along with the necessary wrist pins, ready for installation. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always recommended to consult with your engine builder or refer to Mahle's installation guidelines for specific details regarding ring installation, piston-to-wall clearance, and assembly procedures to ensure optimal performance and longevity in your LS engine build.