Mahle MS Piston Set BBC 503ci 4.28in Bore 4.375in Stroke 6.385in Rod .990 Pin 18cc 10.4 CR Set of 8

If you're building a high-performance Big Block Chevy engine, Mahle's MS Piston Set is designed to handle the demands of a 503 cubic inch displacement. These pistons are crafted to work with a 4.280-inch bore and a 4.375-inch stroke, forming the heart of a powerful engine build. They are engineered for standard deck height blocks, ensuring proper geometry with a 6.385-inch connecting rod and a 0.990-inch wrist pin.

This set features pistons with an 18cc dome volume, which, when combined with the specified bore and stroke, results in a 10.4:1 compression ratio. This compression level is ideal for naturally aspirated performance applications where a balance of power and pump gas compatibility is desired. The pistons are constructed from 4032 aluminum alloy, known for its strength and durability under high temperatures and pressures, while also offering good wear resistance. Each piston weighs approximately 518 grams, contributing to a well-balanced rotating assembly for smoother operation and reduced stress on the crankshaft and bearings.

This set includes eight pistons, enough for a complete V8 engine. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially regarding ring gap and piston-to-wall clearance, to ensure optimal performance and longevity of your engine build.