Mahle MS Piston Sets 488c.i. 4.155bore 4.5stroke 7.1rod 1.26c/h 0.990pin -22ccvol 492g 10.1c/r 4032

If you're building a stroker engine for your Oldsmobile Big Block, this Mahle piston set is designed for a 488 cubic inch displacement. These pistons feature a 4.155-inch bore and are intended for a 4.500-inch stroke, working with a 7.100-inch connecting rod. The 1.260-inch compression height and -22.0cc dish volume contribute to a 10.0:1 compression ratio with a 4032 aluminum alloy.

Mahle uses 4032 aluminum alloy for these pistons, which offers a good balance of strength and thermal expansion properties suitable for many performance street applications. This alloy is known for its durability and resistance to detonation compared to cast aluminum, making it a solid choice for engines that see regular use and demand more from their components. The included 0.990-inch wrist pins are standard for many performance applications, and the pistons weigh in at approximately 491 grams each.

This set is specifically for the Oldsmobile Big Block 455 engine platform, adapted for a stroker setup. Please note that this part is not CARB approved and cannot be shipped to California. It's always a good idea to consult with your engine builder to ensure these specifications align with your overall build goals and intended use.