Mahle MS Pistons LSX 421cid 4.030in Bore 4.125in Stk 6.125in Rod .927 Pin -20cc Dish 9.8CR Set of 8

If you're building a high-performance LSX engine for serious power, Mahle's MS Series pistons are a solid choice for your 421 cubic inch setup. These pistons are crafted to handle the demands of boosted or naturally aspirated builds, offering a robust foundation for your engine's top end. They feature a -20cc dish, which helps achieve a 9.8:1 compression ratio when paired with a 4.125-inch stroke crankshaft and a 6.125-inch connecting rod, making them ideal for a wide range of performance applications.

Mahle uses 2618 aluminum for these pistons, a well-known material in performance circles for its strength and durability under high stress. This specific set is designed for a 4.030-inch bore, and includes a .927-inch pin. The pistons weigh in around 400 grams, which is a good balance for strength without adding excessive rotating mass. This attention to material and design means you can trust these pistons to perform reliably when you push your engine hard.

This set includes eight pistons, enough for a full V8 engine. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's specifications and the manufacturer's installation instructions for proper assembly and tuning.