What is the compression ratio of this piston set?

This Mahle MS Piston Set is designed to achieve a 9.5:1 compression ratio. This is a common ratio that balances power output with drivability for various LS engine builds.

What material are these pistons made from?

These pistons are constructed from a strong 2618 aluminum alloy. This material is chosen for its durability and ability to withstand the high temperatures and pressures found in performance LS engines.

Are these pistons compatible with all LS engines?

This set is specifically designed for Chevrolet LS engines with a 325 cubic inch displacement, featuring a 3.780-inch bore. While it fits many LS applications, it's important to confirm your specific engine's bore and stroke to ensure proper fitment.

Mahle MS Piston Set 3.780in Bore 9.5:1 CR 930218480

Name: Mahle MS Piston Set Chevrolet LS1/2/6 5.3L 326ci 3.780in Bore 3.622in Stk 9.5:1 CR -2.1cc Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-chevrolet-ls1-2-6-5-3l-326ci-3-780in-bore-3-622in-stk--t14-168907
Price: 1009.86 USD
Availability: BackOrder

Mahle MS Piston Set Chevrolet LS1/2/6 5.3L 326ci 3.780in Bore 3.622in Stk 9.5:1 CR -2.1cc Set of 8

$1009.86

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 Chevrolet LS 325 cu in. 3.780in bore, 9.5:1 CR. Engine Piston Set

Key Features

Fits Chevrolet LS 325 cu in. engines.
Features a 3.780-inch bore and 3.622-inch stroke.
Designed for a 9.5:1 compression ratio.
Constructed from strong 2618 aluminum alloy.
Includes -2.1cc valve reliefs for piston-to-valve clearance.
Each piston weighs 424 grams.

This piston set is designed for Chevrolet LS 325 cu in. engines. Please verify compatibility with your specific vehicle and 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

If you're rebuilding the engine in your Chevrolet LS-based vehicle, a solid set of pistons is fundamental to getting the performance and reliability you're after. This Mahle MS Piston Set is built for the 325 cubic inch LS1, LS2, and LS6 engines, featuring a 3.780-inch bore and a 3.622-inch stroke. These pistons are designed to achieve a 9.5:1 compression ratio, which is a popular choice for a wide range of applications, offering a good balance between power and drivability for both naturally aspirated and boosted setups.

Mahle uses a 2618 aluminum alloy for these pistons, a material known for its strength and durability, especially under the high temperatures and pressures found in performance engines. The pistons have a -2.1cc valve relief volume, which is important for proper piston-to-valve clearance, particularly when using aftermarket camshafts or cylinder heads. Each piston weighs in at 424 grams, helping to keep rotating assembly balance consistent. This set includes eight pistons, ready to be installed in your LS engine build.

When installing these pistons, ensure you have the correct ring set and connecting rod bearings to match the piston pin size of 0.927 inches. It's also crucial to follow the manufacturer's recommended clearances for bore hone, piston-to-wall, and bearing clearances to ensure optimal performance and longevity. Remember that this piston set is not CARB approved and cannot be shipped to California.