Mahle MS Piston Set SBF 331ci 4.030in Bore 3.25in Stroke 5.4in Rod .927 Pin -16cc 8.6 CR Set of 8

This Mahle MS Piston Set is built for Ford Small Block 331 cubic inch engines. You get a complete set of eight forged pistons, designed to work with a 4.030-inch bore and a 3.25-inch stroke. Each piston features a -16cc dish, which helps achieve a compression ratio of 8.6:1 when paired with the right cylinder heads and crankshaft. These pistons utilize a standard 0.927-inch wrist pin and a 5.4-inch connecting rod, making them a solid choice for many performance builds.

Mahle uses 4032 aluminum alloy for these pistons, a material known for its strength and durability, especially under high temperatures and pressures. This alloy offers a good balance between expansion characteristics and resistance to detonation, which is crucial for engines that see demanding use. The pistons are forged, meaning they undergo a process that aligns the metal's grain structure, resulting in a stronger and more resilient component compared to cast pistons. This makes them well-suited for applications where increased cylinder pressures are expected, such as forced induction or high-compression naturally aspirated builds.

This set is designed as a direct replacement for the piston components in your Ford Small Block engine. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's specifications and the manufacturer's installation instructions to ensure proper fitment and assembly, especially regarding ring gap, bearing clearance, and piston-to-valve clearance.