What is the advantage of using 4032 aluminum pistons?

Pistons made from 4032 aluminum are forged for increased strength and heat resistance. They also allow for tighter piston-to-wall clearance at operating temperature, which can lead to a quieter engine and reduced wear compared to pistons made from softer alloys like 2618.

What compression ratio do these pistons achieve?

These Mahle pistons are designed to achieve a 10.2:1 compression ratio. This is calculated based on the piston's -5.8cc valve relief volume and the assumption of a specific head gasket thickness and cylinder head chamber volume.

Are these pistons compatible with all LS engines?

This specific set is designed for 378 cubic inch displacement LS engines with a 4.075-inch bore. While many LS engines share commonalities, bore size and displacement vary, so it's important to confirm your engine's specifications match these pistons.

Mahle GM LS Piston Set 4.075in Bore 10.2 CR 930227875

Name: Mahle MS Piston Set GM LS 378cid 4.075in Bore 3.622in Stk 6.125in Rod .927 Pin -5.8cc 10.2 CR
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-378cid-4-075in-bore-3-622in-stk-6-125in-rod-927--t14-1006763
Price: 820.08 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 378cid 4.075in Bore 3.622in Stk 6.125in Rod .927 Pin -5.8cc 10.2 CR

$820.08

On Backorder

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

Mahle forged piston set for GM LS 378cid engines. Features a 4.075in bore and 10.2:1 compression ratio for improved performance.

Key Features

Fits Chevrolet LS 378 cu in engines.
Forged from 4032 aluminum for strength and durability.
4.075 inch bore size.
Achieves a 10.2:1 compression ratio with -5.8cc valve reliefs.
Designed for a 3.622 inch stroke and 6.125 inch connecting rod.
Utilizes a standard .927 inch wrist pin.

This piston set is designed for Chevrolet LS 378 cubic inch engines. Please verify compatibility with your specific vehicle and 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

Secure CheckoutFast Shipping631-982-0042

Product Details

These Mahle MS Series pistons are forged from 4032 aluminum, a material known for its strength and ability to handle high temperatures and pressures, making them a solid choice for performance GM LS engine builds. With a 4.075-inch bore and a -5.8cc valve relief, these pistons are designed to achieve a 10.2:1 compression ratio when paired with the correct components, offering an improved power output over stock configurations.

The stroke is listed at 3.622 inches, and they utilize a 6.125-inch connecting rod with a standard .927-inch wrist pin. Each piston weighs in at 456 grams, contributing to a well-balanced rotating assembly. This set is intended for 378 cubic inch displacement LS engines, commonly found in various Chevrolet applications. The 4032 aluminum construction offers good piston-to-wall clearance at operating temperature, reducing noise and wear compared to older 2618 forgings.

When rebuilding or upgrading your LS engine, choosing pistons that can handle the demands of increased performance is crucial. Mahle's MS Series pistons are a popular option for builders looking for a well-made, reliable component that offers a significant step up from cast pistons. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to manufacturer installation instructions for proper fitment and assembly procedures.