Mahle MS Piston Set Chevy SB 389ci 4.130in Bore 3.625 Stroke 6.125 Rod .927 Pin 9cc 13.5CR -Set Of 8

If you're rebuilding the heart of your Chevrolet Small Block engine for serious performance, a well-built set of pistons is crucial. This Mahle MS Piston Set is designed for 389 cubic inch applications, featuring a 4.130-inch bore and a 3.625-inch stroke, which are key dimensions for achieving that displacement. These pistons are crafted from 2618 aluminum, a material known for its strength and ability to handle high temperatures and pressures, making them a solid choice for performance builds where reliability under stress is paramount.

The design includes a 9cc dish volume, which, combined with the other specified dimensions, results in a 13.5:1 compression ratio. This higher compression ratio is typically aimed at maximizing power output, especially when paired with performance cylinder heads and camshafts. The pistons come with a 6.125-inch rod length compatibility and a .927-inch pin diameter, ensuring they integrate properly with many common performance connecting rods and wrist pins. Each piston weighs in at 444 grams, a detail that helps in balancing the rotating assembly for smoother operation at higher RPMs.

This set includes eight pistons, enough for a complete V8 engine. It's important to note that these pistons are not CARB approved and cannot be shipped to California due to emissions regulations. For builders aiming for a high-performance naturally aspirated engine, these Mahle pistons offer a strong foundation. Always refer to the manufacturer's installation instructions for proper assembly, balancing, and ring gap settings to ensure optimal performance and longevity.