What is the compression ratio achieved with these pistons?

These Mahle MS pistons feature a -4cc dish volume. When used with appropriate cylinder heads and gaskets, they achieve a 10.1:1 compression ratio, which is an improvement over stock configurations.

What material are these pistons made from?

The pistons are forged from 4032 aluminum. This material is chosen for its strength and durability, making it suitable for performance applications and engines that are frequently used or pushed hard.

Are these pistons compatible with all GM LS engines?

These pistons are specifically designed for GM LS engines with a 347 cubic inch displacement and a 3.908 inch bore. While they are a popular choice for many LS builds, it's important to verify compatibility with your specific engine configuration and intended use.

Mahle GM LS Piston Set 3.908in Bore 930217608

Name: Mahle MS Piston Set GM LS 347ci 3.908in Bore 3.622in Stk 6.098in Rod .945 Pin -4cc 10.1 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-347ci-3-908in-bore-3-622in-stk-6-098in-rod-945-p-t14-29200
Price: 837.48 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 347ci 3.908in Bore 3.622in Stk 6.098in Rod .945 Pin -4cc 10.1 CR Set of 8

$837.48

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 347ci engines. Features a 3.908in bore and 10.1 CR for improved performance.

Key Features

Fits GM LS 347ci engines.
Forged 4032 aluminum construction for strength and durability.
3.908 inch bore size.
3.622 inch stroke.
Designed for a 6.098 inch connecting rod and .945 inch pin.
-4cc piston dish volume for a 10.1:1 compression ratio.

This piston set is designed for GM LS engines with a 348 cubic inch displacement. Check manufacturer specifications to confirm 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 rebuilding the heart of your GM LS engine, Mahle's MS Piston Set is a solid choice for getting more out of your 347 cubic inch displacement. These pistons are built to handle the demands of a performance-oriented build, offering a specific bore size of 3.908 inches and a stroke of 3.622 inches. They are designed to work with a 6.098-inch rod and feature a .945-inch pin, a common size for many LS applications.

What sets these pistons apart is their construction and design for a specific compression ratio. With a -4cc dish volume, they achieve a 10.1:1 compression ratio when paired with the right cylinder heads and gasket combination. This is a notable increase over stock, which can lead to improved throttle response and overall power output. The pistons themselves are forged from 4032 aluminum, a material known for its strength and durability, making them well-suited for engines that see regular use or are pushed harder. Each piston weighs in at approximately 411 grams, contributing to a well-balanced rotating assembly.

This set includes all eight pistons needed for a V8 engine. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a complete build, ensure you have the correct rings, connecting rods, and bearings to match the specifications of these Mahle pistons.