What is the compression ratio with these pistons?

These pistons feature a -4.2cc dish volume. When used with appropriate cylinder heads and a stock stroke 3.622 inch crankshaft, they achieve a 10.3:1 compression ratio.

What material are these pistons made from?

The pistons are forged from 4032 aluminum. This material is chosen for its strength, durability, and resistance to expansion, making it well-suited for performance engine builds.

Are these pistons compatible with all GM LS engines?

This specific set is designed for GM LS engines with a 329 cubic inch displacement and a 3.800 inch bore. It is important to verify your engine's specifications to ensure proper fitment.

Mahle GM LS Piston Set 3.800in Bore 930217800

Name: Mahle MS Piston Set GM LS 329ci 3.800in Bore 3.622 Stk 6.098 in Rod .945 Pin -4cc 10.3 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-329ci-3-800in-bore-3-622-stk-6-098-in-rod-945-pi-t14-30067
Price: 907.99 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 329ci 3.800in Bore 3.622 Stk 6.098 in Rod .945 Pin -4cc 10.3 CR Set of 8

$907.99

On Backorder

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

Mahle GM LS forged piston set for 329ci engines. Features a 3.800in bore and 10.3 compression ratio.

Key Features

Fits GM LS 329 cu in engines.
Forged from 4032 aluminum for strength and durability.
3.800 inch bore size.
Features a -4.2cc dish volume for a 10.3:1 compression ratio.
Includes a 6.098 inch rod length and a .945 inch pin diameter.
Each piston weighs 414 grams.

This piston set is designed for GM LS 329 cu in engines. Not CARB approved; cannot ship to California.

⚠️ 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 is a well-known name in engine components, particularly for their piston technology. This Mahle MS Piston Set is built for GM LS engines displacing 329 cubic inches, offering a solid foundation for a performance rebuild or upgrade. If you're looking to enhance your LS engine's power and efficiency, a well-chosen piston set like this is a critical piece of the puzzle.

These pistons are forged from 4032 aluminum, a material known for its strength and durability, making them suitable for demanding applications. They feature a 3.800-inch bore and a 3.622-inch stroke, with a 6.098-inch rod length and a .945-inch pin diameter. The dish volume is -4.2cc, which results in a 10.3:1 compression ratio when paired with the correct components, offering an improved power band without sacrificing too much drivability. Each piston weighs in at 414 grams, contributing to a balanced rotating assembly.

This set includes eight pistons, designed to fit right into your GM LS engine. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always a good idea to consult your engine builder or a trusted mechanic to ensure this piston set is the right choice for your specific build goals and to confirm all necessary supporting components are accounted for.