What is the compression ratio of this piston set?

This Mahle MS Piston Set is designed to achieve a 12.2:1 compression ratio. This is influenced by the -2.5cc dish volume on the piston and the specific cylinder heads used in your engine build.

What material are these pistons made from?

These pistons are forged from 4032 aluminum. This material is chosen for its high strength and durability, making it suitable for demanding performance engine applications.

Are these pistons compatible with all LS engines?

This set is specifically designed for 427 cubic inch (428cid) LS applications, particularly those using LS7-style heads. While it uses common LS dimensions, it's crucial to confirm compatibility with your specific engine configuration and intended build.

Mahle GM LS Piston Set 4.125in Bore 12.2 CR 930221525

Name: Mahle MS Piston Set GM LS 427ci 4.125in Bore 4in Stk 6.067in Rod .927 Pin -2.5cc 12.2 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-427ci-4-125in-bore-4in-stk-6-067in-rod-927-pin-2-t14-28775
Price: 797.95 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 427ci 4.125in Bore 4in Stk 6.067in Rod .927 Pin -2.5cc 12.2 CR Set of 8

$797.95

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle MS Piston Set for GM LS 427ci engines. Features a 4.125in bore and 12.2:1 compression ratio for improved performance.

Key Features

Fits Chevrolet LS7 428 cu in. engines.
Forged 4032 aluminum construction for strength and durability.
4.125 inch bore size.
-2.5cc piston dish volume.
12.2:1 compression ratio.
Designed for 4.000 inch stroke and 6.067 inch connecting rods.

This piston set is designed for Chevrolet LS7 428 cu in. engines. Please verify compatibility with your specific engine build and cylinder heads.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

Mahle's MS Piston Set for GM LS engines starts with a -2.5cc dish volume, a key design choice that contributes to a 12.2:1 compression ratio when paired with compatible cylinder heads. This set is specifically built for 427 cubic inch (428cid) LS applications, utilizing a 4.125-inch bore and a 4.000-inch stroke, which is a common configuration for enhanced displacement in LS builds.

These pistons are forged from 4032 aluminum, a material known for its strength and durability, making them well-suited for high-performance engines. The 6.067-inch connecting rod length and 0.927-inch pin diameter are standard dimensions for many LS performance builds, ensuring good compatibility. With a weight of 447 grams per piston, they offer a solid balance between strength and rotational mass. This set is designed to work with LS7-style heads, making it a strong option for those rebuilding or upgrading their LS7 or similar 7.0L engines.

This piston set is intended for performance applications and is not CARB approved, meaning it cannot be shipped to California. Ensure you have the correct cylinder heads and supporting components to achieve the intended compression ratio and performance goals for your build.