Mahle MS Piston Set BBC 498ci 4.320in Bore 4.25in Stroke 6.385in Rod 0.990 Pin -3cc 8.8 CR Set of 8

Forged from 4032 aluminum alloy, these Mahle MS pistons are built for the demands of a 498 cubic inch Big Block Chevy engine. The material choice here is notable; 4032 alloy offers a good balance of strength and thermal expansion characteristics, making it a solid option for performance street or strip applications where you need reliability without the extreme expansion of some other alloys. Each piston is precision-machined to a 4.320-inch bore size, with a -3.4cc dish volume that helps achieve a target compression ratio of 8.8:1 when paired with a 4.250-inch stroke crankshaft and a 6.385-inch connecting rod.

Mahle has designed these pistons with a standard 0.990-inch wrist pin diameter, common for many performance Big Block Chevy builds, ensuring good compatibility with a wide range of connecting rods. The flat-top design with valve reliefs is crucial for proper valve-to-piston clearance, especially in higher-performance camshaft applications. At 485 grams each, these pistons are well-balanced for their size and intended use, contributing to smoother engine operation and reduced stress on the rotating assembly. This set includes eight pistons, ready for your next engine build.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's detailed installation instructions and specifications to ensure proper fitment and performance in your specific engine combination. Proper ring groove sizing and piston-to-wall clearance are critical for longevity and performance.