What is the compression ratio of this piston set?

This Mahle piston set is designed to achieve a 10.8:1 compression ratio. This is calculated based on the piston's dish volume, bore size, stroke, and typical head gasket thickness for GM LS engines.

What materials are these pistons made from?

These pistons are forged from 4032 aluminum. This material is chosen for its high strength and excellent thermal expansion characteristics, making it well-suited for performance applications.

Are these pistons compatible with a stock GM LS engine?

While these pistons are designed for GM LS engines, they are intended for performance builds aiming for a 428 cubic inch displacement with specific stroke and rod lengths. They may require other supporting modifications for optimal performance and fitment.

Mahle GM LS Piston Set 4.075in Bore 10.8 CR 930225275

Name: Mahle MS Piston Set GM LS 428ci 4.075in Bore 4.1in Stk 6.125in Rod .927 Pin -8cc 10.8 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-428ci-4-075in-bore-4-1in-stk-6-125in-rod-927-pin-t14-28786
Price: 912.97 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 428ci 4.075in Bore 4.1in Stk 6.125in Rod .927 Pin -8cc 10.8 CR Set of 8

$912.97

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 GM LS 428ci 4.075in Bore 4.1in Stk 6.125in Rod .927 Pin -8cc 10.8 CR Set of 8Engine Piston Set

Key Features

Fits Chevrolet LS 430 cu in engines.
Forged from 4032 aluminum for strength and thermal stability.
Features a 4.075-inch bore size.
Designed for a 4.1-inch crankshaft stroke.
Accommodates a 6.125-inch connecting rod length.
Utilizes a .927-inch wrist pin diameter.

This piston set is designed for Chevrolet LS engines with a 430 cubic inch displacement. Please verify compatibility with your specific engine configuration.

⚠️ 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 is built for GM LS engines looking to achieve a 428 cubic inch displacement with a 4.075-inch bore. These pistons are forged from 4032 aluminum, a material known for its strength and resistance to thermal expansion, making them a solid choice for high-performance builds. The -8cc valve reliefs are designed to provide ample clearance for your camshaft lobes, accommodating a 4.1-inch stroke and a 6.125-inch connecting rod with a .927-inch pin diameter.

This set is engineered to achieve a 10.8:1 compression ratio when paired with the specified stroke and rod length, offering a notable increase in power potential over stock configurations. Each piston weighs in at approximately 436 grams, contributing to a well-balanced rotating assembly. The 4032 aluminum construction means these pistons are well-built to handle the stresses of performance driving, offering improved durability and reliability for your engine build.

This piston set is sold as a complete set of 8, ensuring you have everything needed for a full engine rebuild. Please note that this specific piston set is not CARB approved and cannot be shipped to California. It's always a good idea to consult with your engine builder to ensure this piston set aligns with your specific build goals and supporting modifications.