Mahle MS Piston Set GM LS 383ci 3.908in Bore 4in Stroke 6.125in Rod .927 Pin -6cc 10.8 CR Set of 8

If you're building a high-performance GM LS engine, getting the right pistons is crucial for power and reliability. This Mahle MS Piston Set is designed for 383 cubic inch (384 cid) applications, featuring a 3.908-inch bore and a 4-inch stroke. These pistons are forged from 4032 aluminum, a material known for its strength and durability, making them a solid choice for demanding builds. The -6cc valve reliefs are designed to provide proper clearance for your camshaft and valves, contributing to a 10.8:1 compression ratio with a 4-inch stroke and 6.125-inch connecting rod. Each piston weighs in at approximately 387 grams, which helps to keep reciprocating assembly weight manageable.

Mahle has a long-standing reputation for producing well-built engine components, and this piston set is no exception. The 4032 aluminum construction offers improved thermal expansion characteristics compared to other aluminum alloys, meaning they can handle higher temperatures and pressures without excessive expansion. This is important for maintaining consistent performance and preventing piston slap. The .927-inch pin diameter is standard for many LS applications, ensuring compatibility with a wide range of connecting rods. This set includes all eight pistons needed for a complete engine build.

When assembling your engine, pay close attention to the manufacturer's installation instructions, especially regarding ring gap and piston-to-wall clearance. These Mahle pistons are intended for performance builds and are not CARB approved, so they cannot be shipped to California. Ensure your build plans align with these specifications for optimal results.