What is the compression ratio with these pistons?

When used with compatible cylinder heads, these pistons will result in a 10.1:1 compression ratio. This is achieved through the -16cc inverted dome volume on each piston.

What material are these pistons made from?

These Mahle pistons are forged from a 2618 aluminum alloy. This material is chosen for its strength and ability to withstand the high pressures and temperatures found in performance engines.

Are these pistons legal for use in California?

No, these pistons are not CARB approved and cannot be shipped to California. Please check local regulations regarding emissions compliance for engine modifications.

Mahle GM LT1 Piston Set 4.065in Bore 930228365

Name: Mahle MS Piston Set GM LT1 376ci 4.065in Bore 3.622in Stk 6.125in Rod -16cc 10.1 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-lt1-376ci-4-065in-bore-3-622in-stk-6-125in-rod-16cc-t14-29421
Price: 1024.61 USD
Availability: BackOrder

Mahle MS Piston Set GM LT1 376ci 4.065in Bore 3.622in Stk 6.125in Rod -16cc 10.1 CR Set of 8

$1024.61

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 LT1 376ci engines. Features a 4.065in bore and 10.1 CR for improved performance.

Key Features

This is a set of 8 Mahle MS pistons for GM LT1 376ci engines.
Features a 4.065 inch bore and 3.622 inch stroke.
Designed for use with 6.125 inch connecting rods.
The inverted dome design has a -16cc volume, resulting in a 10.1:1 compression ratio.
Constructed from strong 2618 aluminum alloy for durability.
Each piston weighs 440 grams.

⚠️ 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 top end of your GM LT1 376 cubic inch engine, this Mahle MS Piston Set is a solid choice. These pistons are specifically made for the LT1, L86, and LT4 cylinder heads, ensuring a proper fit and function for your build. They're designed to work with the stock 3.622-inch stroke and a 6.125-inch connecting rod, making them a straightforward upgrade for many LT1 applications.

Mahle uses a 2618 aluminum alloy for these pistons, which is known for its strength and durability under high stress. This material is well-suited for performance builds where you expect higher cylinder pressures and temperatures. The pistons feature an inverted dome design with a -16cc volume, contributing to a 10.1:1 compression ratio when paired with compatible heads. This compression ratio is a good balance for street performance and track use, offering improved power without being overly sensitive to fuel octane.

Each piston weighs in at 440 grams, which is a reasonable weight for a forged piston of this caliber. The set includes eight pistons, along with the necessary pins and locks to get them installed. 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.