What is the compression ratio achieved with these pistons?

These pistons are designed with 2cc valve reliefs to achieve a 10.8:1 compression ratio. This ratio is dependent on the cylinder head volume and head gasket thickness used in your build.

What material are these pistons made from and why is it important?

The pistons are made from 4032 aluminum. This alloy is chosen for its strength and controlled thermal expansion, which helps reduce piston slap and noise, especially during engine warm-up.

Are these pistons compatible with forced induction setups?

While designed for a 10.8:1 compression ratio, these pistons are a popular choice for performance builds, including those with forced induction. Their robust construction from 4032 aluminum can handle increased cylinder pressures when properly tuned.

Mahle GM L92/LS3 Piston Set 4.075in Bore 197719275

Name: Mahle MS Piston Set GM L92/LS3 378ci 4.075in Bore 3.622stk 6.125in Rod 0.927 Pin 2cc 10.8CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-l92-ls3-378ci-4-075in-bore-3-622stk-6-125in-rod-0-9-t14-132249
Price: 867.88 USD
Availability: BackOrder

Mahle MS Piston Set GM L92/LS3 378ci 4.075in Bore 3.622stk 6.125in Rod 0.927 Pin 2cc 10.8CR Set of 8

$867.88

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 L92/LS3 378ci engines. 4.075in bore, 10.8CR.

Key Features

Fits GM L92 and LS3 engines with 378 cubic inches displacement.
Features a 4.075-inch bore size.
Constructed from 4032 aluminum for improved thermal expansion and durability.
Designed for a 3.622-inch stroke and 6.125-inch connecting rod length.
Utilizes a 0.927-inch wrist pin diameter.
Includes 2cc valve reliefs to achieve a 10.8:1 compression ratio.

⚠️ 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, and they're particularly recognized for their piston technology. This MS Piston Set is built for GM L92 and LS3 engines, specifically for builds around 378 cubic inches. If you're putting together a performance engine or rebuilding a high-output LS-based powerplant, these pistons are designed to handle the demands.

These pistons feature a 4.075-inch bore and are crafted from 4032 aluminum, a material chosen for its strength and thermal expansion properties, which helps reduce piston slap and noise. They have a 3.622-inch stroke compatibility, a 6.125-inch rod length, and a 0.927-inch pin diameter, all standard for many performance LS applications. With a 2cc valve relief volume, they are designed to achieve a 10.8:1 compression ratio when paired with the right cylinder heads and gasket combination, making them a solid choice for naturally aspirated or forced induction builds where controlled compression is key. Each piston weighs in at 497 grams, contributing to a balanced rotating assembly.

This set includes eight pistons, enough for a complete V8 engine. Keep in mind 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.