Mahle MS Piston Set GM LS 403ci 4.005in Bore 4in Stroke 6.125in Rod .927 Pin -12cc 10.5 CR Set of 8

This Mahle MS Piston Set includes eight forged pistons designed for GM LS engines displacing 403 cubic inches. Each piston features a 4.005-inch bore, a 4-inch stroke, and is built to work with a 6.125-inch connecting rod and a 0.927-inch wrist pin. The pistons are crafted from 4032 aluminum, known for its strength and thermal expansion properties, making them a solid choice for performance builds. With a dish volume of -12cc, these pistons achieve a 10.5:1 compression ratio when paired with a compatible cylinder head and gasket combination, offering an improved power output over stock configurations.

Mahle's MS series pistons are forged from 4032 aluminum, a material that balances durability with lighter weight compared to cast pistons. This specific set is engineered for a 4.005-inch bore and a 4-inch stroke, common in 403ci LS engine builds. The included 0.927-inch wrist pins are a standard size for many performance LS applications. The -12cc dish volume is carefully calculated to achieve a 10.5:1 compression ratio, which is a popular target for naturally aspirated or mild forced induction builds seeking a noticeable increase in performance without compromising reliability. Each piston weighs approximately 411 grams, contributing to reduced reciprocating mass for better engine response.

This set is intended for engine builders and performance enthusiasts looking to rebuild or upgrade their GM LS engine. Please note that these pistons are not CARB approved and cannot be shipped to California. It's recommended to consult with your engine builder or refer to Mahle's technical documentation for specific installation guidelines and compatibility with other engine components to ensure optimal performance and longevity.