What is the compression ratio of this piston set?

This Mahle MS Piston Set is designed to achieve a 9.3:1 compression ratio. This is calculated based on the piston's -12cc dish volume and the specific bore and stroke dimensions when used with appropriate cylinder heads and gaskets.

What material are these pistons made from?

These pistons are forged from 2618 aluminum. This material is chosen for its superior strength and durability compared to cast aluminum, making it well-suited for high-performance engine applications.

Are these pistons compatible with standard connecting rods?

Yes, these pistons use a standard 0.927 inch wrist pin. This size is common and makes them compatible with a wide range of aftermarket and stock connecting rods for GM LS engines.

Mahle GM LS Piston Set 4.07in Bore 930225470

Name: Mahle MS Piston Set GM LS 376ci 4.07in Bore 3.622in Stk 6.125in Rod .927 Pin -12cc 9.3 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-376ci-4-07in-bore-3-622in-stk-6-125in-rod-927-pi-t14-521735
Price: 860.80 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 376ci 4.07in Bore 3.622in Stk 6.125in Rod .927 Pin -12cc 9.3 CR Set of 8

$860.80

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 376ci engines. Features a 4.07in bore and 9.3:1 compression ratio for improved performance.

Key Features

Fits GM LS 376ci (377cid) engines.
Forged from 2618 aluminum for strength and durability.
Features a 4.070 inch bore and 3.622 inch stroke.
Designed with a -12cc dish volume for a 9.3:1 compression ratio.
Utilizes a 0.927 inch wrist pin for broad compatibility.
Each piston weighs 458 grams.

This piston set is designed for Chevrolet LS 377 cu in engines. Please verify compatibility with your specific 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

Mahle's MS Piston Set for GM LS engines is built with 2618 aluminum, a strong material chosen for its ability to handle high performance demands. This set is specifically designed for 376 cubic inch (377cid) LS applications, featuring a 4.070 inch bore and a 3.622 inch stroke, which works with a 6.125 inch connecting rod. The pistons are forged, meaning they start as a solid block of aluminum that's heated and hammered into shape, making them significantly stronger and more durable than cast pistons. This strength is crucial for engines that see hard use or are built for increased power output.

Each piston in this set is designed with a -12cc dish volume, contributing to a 9.3:1 compression ratio when paired with the correct cylinder heads and gasket combination. This compression ratio is a solid choice for a street-driven performance engine, offering a good balance between power and drivability without requiring extremely high octane fuel in most setups. The pistons weigh in at 458 grams each, which is a reasonable weight for a forged piston of this size, helping to keep reciprocating mass in check. They utilize a standard 0.927 inch wrist pin, making them compatible with a wide range of aftermarket and stock connecting rods.

This set includes eight pistons, enough for a complete engine rebuild. It's important to note that these pistons are not CARB approved and cannot be shipped to California. If you're rebuilding a GM LS engine and looking for a well-built, forged piston set that can handle increased performance, this Mahle MS Piston Set is a strong option to consider.