Mahle MS Piston Set BBC Mar 509ci 4.50in Bore 4in Stroke 6.135in Rod 0.990 Pin -3cc 9.0 CR Set of 8

This Mahle MS Piston Set is designed as a direct replacement for Big Block Chevy 509 cubic inch marine applications. You get a complete set of eight pistons, ready to be installed in your engine build. These pistons are crafted from 4032 aluminum, a material known for its strength and thermal expansion properties, making it a solid choice for performance engines that see regular use.

With a 4.500-inch bore and a 4.000-inch stroke, these pistons are specifically sized for the 509ci displacement. They feature a -3cc dish volume, which, when paired with a 4.000-inch stroke and a 6.135-inch connecting rod, results in a 9.0:1 compression ratio. This compression ratio is well-suited for many naturally aspirated or forced induction marine applications, offering a good balance of power and reliability. The pistons utilize a 0.990-inch wrist pin, a common size for these engines, and each piston weighs in at 661 grams, contributing to overall engine balance.

It's important to 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 to ensure optimal performance and longevity of your engine.