What is the compression ratio of these pistons?

These Mahle pistons feature 9.2cc valve reliefs, which result in a 14.1 compression ratio when used with a 4.000-inch stroke crankshaft and appropriate cylinder heads. This is a high compression ratio suitable for performance builds.

Are these pistons suitable for all LS engines?

This specific set is designed for 418 cubic inch (417cid) Chevrolet LSX engines with a 4.080-inch bore and a 4.000-inch stroke. While they are LS-based, their dimensions and compression ratio are tailored for this particular displacement and application.

What does 'Not CARB approved' mean for this product?

This means the pistons do not meet the emissions standards set by the California Air Resources Board (CARB). Consequently, they cannot be legally shipped to or installed on vehicles registered in California.

Mahle LS Forged Piston Set 4.080in Bore 14.1 CR 930229680

Name: Mahle MS Chevrolet LS 6.8L 417cid 4.080in Bore x 1.110RCH 4.000 Stroke 9.2cc 14.1 CR - Pist Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-chevrolet-ls-6-8l-417cid-4-080in-bore-x-1-110rch-4-000-stroke-9-2-t14-461002
Price: 987.55 USD
Availability: BackOrder

Mahle MS Chevrolet LS 6.8L 417cid 4.080in Bore x 1.110RCH 4.000 Stroke 9.2cc 14.1 CR - Pist Set of 8

$987.55

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 forged piston set for Chevrolet LS 418 cu in engines. 4.080in bore, 14.1 CR. Not CARB approved.

Key Features

Fits Chevrolet LSX 418 cu in engines.
Forged from 2618 aluminum for strength and durability.
4.080 inch bore size.
Designed for a 4.000 inch stroke.
Features 9.2cc valve reliefs for a 14.1 compression ratio.
Includes 0.927 inch wrist pins.

This piston set is designed for Chevrolet LSX 418 cu in engines. Please verify compatibility with your specific engine build.

⚠️ 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

If you're building a high-performance Chevrolet LS engine, especially one aiming for significant displacement like a 418 cubic inch (417cid) setup, Mahle's MS forged piston set is a solid choice. These pistons are designed to handle the stresses of a performance build, offering a robust foundation for your engine's top end. They feature a 4.080-inch bore and are engineered for a 4.000-inch stroke, which is key for achieving that 418 cubic inch displacement.

Crafted from 2618 aluminum, a material known for its strength and durability under high temperatures and pressures, these pistons are built for demanding applications. The set includes pistons with a 9.2cc valve relief volume, contributing to a 14.1 compression ratio when paired with appropriate cylinder heads and a 4.000-inch stroke crankshaft. This compression ratio is ideal for naturally aspirated or forced induction builds seeking maximum power output. The 0.927-inch pin diameter is standard for many LS applications, simplifying installation with common connecting rods.

This set is for a complete engine rebuild, including eight pistons, each weighing approximately 484 grams. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially when dealing with critical engine components like pistons.