Mahle MS Piston Set Chevy SB 400ci 4.125in Bore 3.5/3.75 Stroke 6.125/6 Rod .927Pin -9cc 12.7/13.5CR

Mahle is a well-known name in engine components, especially for their high-performance pistons. This Mahle MS Piston Set is built for the Chevrolet Small Block 400ci engine, designed for builders looking to push the limits of their engine. It features a 4.125-inch bore and is engineered to work with either a 3.5-inch or 3.75-inch stroke crankshaft, paired with 6.125-inch or 6-inch connecting rods. The .927-inch pin size is standard for many performance applications.

These pistons are forged from 2618 aluminum, a strong material commonly used in high-performance applications because it can withstand the extreme pressures and temperatures found in powerful engines. They have a -9cc dish volume, which is crucial for achieving a specific compression ratio. When combined with the 4.125-inch bore and a 3.625-inch stroke, this dish volume results in a calculated compression ratio of approximately 12.9:1, or 12.7:1 to 13.5:1 depending on the exact stroke and rod combination and head gasket thickness. This level of compression is typically for race gas or E85 applications where detonation control is paramount. Each piston weighs in at around 404 grams, keeping rotating assembly weight manageable for better engine response.

It's important to note that these pistons are not CARB approved and cannot be shipped to California due to emissions regulations. Always refer to the manufacturer's detailed specifications and installation guide for precise measurements and compatibility with your specific build. This set is intended for serious engine builds where performance and durability under demanding conditions are the primary goals.