What is the compression ratio achieved with these pistons?

These Mahle pistons feature a -4.2cc dish volume. When used with appropriate cylinder heads and gaskets for an LS 5.3L engine, this is designed to achieve a 9.8:1 compression ratio.

Are these pistons suitable for a stock LS 5.3L engine rebuild?

These are forged pistons, which are generally stronger than cast pistons and better suited for performance builds or engines that will see heavy use. They are a good option for a performance-oriented rebuild of an LS 5.3L engine.

Can these pistons be shipped to California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle LS Piston Set 3.800in Bore 930218800

Name: Mahle MS Piston Set LS 5.3L 3.800in Bore 3.622in Stroke 6.125in Rod .927in Pin -4.2cc 9.8 CR
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-ls-5-3l-3-800in-bore-3-622in-stroke-6-125in-rod-927in--t14-666220
Price: 849.72 USD
Availability: BackOrder

Mahle MS Piston Set LS 5.3L 3.800in Bore 3.622in Stroke 6.125in Rod .927in Pin -4.2cc 9.8 CR

$849.72

On Backorder

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

Mahle LS 5.3L forged piston set with a 3.800in bore and 9.8:1 compression ratio.

Key Features

Fits Chevrolet LS 329 cu in engines.
Forged from 2618 aluminum alloy for strength.
3.800-inch bore diameter.
-4.2cc piston dish volume for a 9.8:1 compression ratio.
6.125-inch rod length and 3.622-inch stroke.
0.927-inch pin diameter.

This piston set is designed for Chevrolet LS engines with a 329 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 2618 aluminum alloy pistons are a solid choice for rebuilding your LS engine, especially if you're looking to get more out of your 5.3L displacement. These pistons feature a 3.800-inch bore and a -4.2cc dish volume, which helps achieve a 9.8:1 compression ratio when paired with the correct cylinder heads and gasket combination. The 6.125-inch rod length and 3.622-inch stroke are standard for many LS applications, making this set a direct replacement for many builds.

Crafted from 2618 aluminum, these pistons are well-built to handle the stresses of performance driving. The 0.927-inch pin diameter is common for LS engines, and the 427-gram weight is typical for forged pistons of this size. Mahle has designed these pistons with a specific dish volume to work with common LS cylinder heads, aiming for that 9.8:1 compression target. This set is intended for engine builders who know the specific requirements of their build and are looking for a reliable, forged piston from a well-known manufacturer.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're planning a performance build or a complete engine overhaul, this Mahle piston set offers a strong foundation. Always refer to your engine builder's specifications and the manufacturer's installation instructions to ensure proper fitment and performance for your specific application.