Mahle MS Piston Set GM LSX 415cid 4.000x1.050RCH 4.125 Stk 6.125 Rod .927 Pin -5.8cc 11.1CR Set of 8

If you're building a serious performance LS engine, Mahle's MS Piston Set is designed to handle the demands of a 415 cubic inch displacement. These pistons are forged from 2618 aluminum, a strong material known for its durability under high stress and temperature conditions, making them a solid choice for boosted or naturally aspirated builds pushing the limits. The 4.000-inch bore and 4.125-inch stroke combination is a popular setup for achieving that 415cid displacement, and these pistons are specifically machined to match that configuration.

Each piston in this set features a -5.8cc valve relief, which is crucial for proper valve-to-piston clearance, especially when using higher-lift camshafts common in performance LS builds. They are designed to work with a 6.125-inch connecting rod and a standard 0.927-inch wrist pin, ensuring compatibility with many popular aftermarket and some OEM connecting rod setups. The 11.1:1 compression ratio is optimized for pump gas in many naturally aspirated applications, but it also works well with boost if you're looking for a specific compression target. Weighing in at 403 grams, these pistons offer a good balance of strength and weight for their size.

This set includes eight pistons, enough for a complete V8 engine. Remember that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially regarding ring gap and piston-to-wall clearance, which are critical for engine longevity and performance.