What is the compression ratio with these pistons?

These Mahle pistons are designed to achieve a 9.3:1 compression ratio. This is calculated based on the piston's -2.2cc valve relief volume and compatibility with 5.7L and 6.1L Hemi cylinder heads.

What material are these pistons made from?

The pistons are constructed from 4032 aluminum alloy. This material is chosen for its strength and resistance to expansion at high temperatures, making it suitable for performance engine builds.

Can these pistons be shipped to California?

No, this piston set is not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle Hemi Piston Set 3.937in Bore 930276237

Name: Mahle MS Piston Set Hemi 394ci 3.937in Bore 4.05in Stroke 6.125in Rod .927 Pin -2cc 9.3 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-hemi-394ci-3-937in-bore-4-05in-stroke-6-125in-rod-927--t14-29451
Price: 860.13 USD
Availability: BackOrder

Mahle MS Piston Set Hemi 394ci 3.937in Bore 4.05in Stroke 6.125in Rod .927 Pin -2cc 9.3 CR Set of 8

$860.13

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 Hemi 394ci 3.937in Bore 4.05in Stroke 6.125in Rod .927 Pin -2cc 9.3 CR Set of 8Engine Piston Set

Key Features

This is a set of 8 Mahle MS Hemi pistons.
Designed for 394 cubic inch Hemi engines.
Features a 3.937-inch bore and 4.050-inch stroke.
Utilizes a 6.125-inch rod length and a .927-inch pin.
Includes -2.2cc valve reliefs for a 9.3:1 compression ratio.
Constructed from 4032 aluminum alloy for durability.

This piston set is designed for Chrysler Hemi 394 cu in engines. It is compatible with all 5.7L and 6.1L Hemi heads.

⚠️ 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

This Mahle MS Piston Set is built for Hemi engines displacing 394 cubic inches. You get a complete set of eight pistons, each designed to work with both 5.7L and 6.1L Hemi heads. These pistons feature a 3.937-inch bore and a 4.050-inch stroke, with a 6.125-inch rod length and a .927-inch pin diameter. The -2.2cc valve relief creates a compression ratio of 9.3:1, making them a solid choice for rebuilding or upgrading your Hemi's top end.

Mahle uses 4032 aluminum alloy for these pistons, which is known for its strength and durability, especially under high temperatures. This material choice helps ensure reliable performance and longevity for your engine. Each piston weighs in at 408 grams, contributing to a well-balanced rotating assembly. The design accounts for a 3.937-inch bore and a 4.050-inch stroke, with a specific valve relief volume of -2.2cc, which is crucial for achieving the target 9.3:1 compression ratio with compatible cylinder heads.

This set is intended for performance-oriented Hemi builds and is not CARB approved, meaning it cannot be shipped to California. Ensure you have the correct tools and knowledge for engine assembly, as proper installation is key to realizing the full potential of these well-made pistons.