Mahle MS Chrysler Hemi 4.090in Bore 4.050in Stk 6.125in Rod -12cc 10.2 CR w/TBC - Set of 8

If you're rebuilding a Chrysler Hemi 426 cubic inch engine and aiming for a significant compression increase, this Mahle MS piston set is built for that job. These pistons are designed to work with a 4.090-inch bore and a 4.050-inch stroke, creating a 426 cubic inch displacement. They feature a -12cc dish volume, which helps achieve a 10.2:1 compression ratio when paired with the right cylinder heads and gasket combination, making them suitable for builds that demand more power and responsiveness.

Crafted from 4032 aluminum alloy, these pistons are well-built for high-performance applications. The 4032 alloy offers a good balance of strength and lighter weight compared to cast pistons, and it's known for its thermal expansion properties, which are important in high-heat engine environments. Each piston weighs in at 431 grams, contributing to overall engine balance. They also come with a Top-Before-Coating (TBC) treatment on the piston skirt, which is a dry lubricant coating that helps reduce friction during the critical break-in period and can improve overall engine longevity.

This set includes eight pistons, eight wrist pins, and locks, all ready for installation. Remember that these pistons are not CARB approved and cannot be shipped to California. For a successful installation, ensure you consult the manufacturer's specifications for proper ring gap, piston-to-wall clearance, and assembly procedures, especially when working with a performance Hemi engine.