Mahle MS Piston Set GM LSX 438ci 4.125in Bore 4.1in Stk 6.125in Rod .927 Pin -8cc 11.1 CR Set of 8

If you're building a high-performance GM LSX engine, a solid set of pistons is crucial for handling the increased power and stress. This Mahle MS Piston Set is designed for LSX engines with a 438 cubic inch displacement, featuring a 4.125-inch bore and a 4.1-inch stroke, paired with 6.125-inch connecting rods. These pistons are built to handle the demands of a performance build, offering a compression ratio of 11.1:1 with an -8cc dish volume, which is ideal for naturally aspirated or forced induction setups looking for a balance of power and drivability.

Mahle uses a 4032 aluminum alloy for these pistons, known for its strength and durability, especially at higher temperatures. This material choice helps prevent piston expansion and reduces the risk of detonation under load. The pistons come with a standard 0.927-inch pin diameter, ensuring compatibility with many popular aftermarket connecting rods. Each piston weighs approximately 426 grams, contributing to a well-balanced rotating assembly, which is vital for engine longevity and smooth operation at high RPMs. This set includes all eight pistons needed for a complete engine rebuild.

When assembling your engine, pay close attention to the piston-to-wall clearance and ring gap specifications provided by Mahle to ensure optimal performance and break-in. Remember, this piston set is not CARB approved and cannot be shipped to California. Always consult your engine builder or Mahle's technical documentation for specific installation guidelines and recommended clearances for your particular application.