What is the compression ratio achieved with these pistons?

These Mahle MS pistons are designed to achieve an 11.5:1 compression ratio. This is calculated based on the piston's -5cc dish volume, a 4.040-inch bore, a 3.875-inch stroke, and a 6.0-inch connecting rod.

Are these pistons suitable for daily driving or only for racing?

The 4032 aluminum construction and the targeted compression ratio make these pistons well-suited for performance applications, including racing and high-performance street use. They are built to handle the stresses of demanding engine operation.

What other components are typically needed when installing these pistons?

When installing these pistons, you will typically need matching connecting rods, a crankshaft, piston rings, wrist pins (often included, but verify), and appropriate engine bearings. It's also recommended to have your cylinders honed to match the piston bore size.

Mahle Forged Piston Set 4.040in Bore -5cc Dish SBC 930200840

Name: Mahle MS Piston Set SBC 397ci 4.040in Bore 3.875in Stroke 6.0in Rod .927 Pin -5cc 11.5 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbc-397ci-4-040in-bore-3-875in-stroke-6-0in-rod-927-pi-t14-29184
Price: 831.48 USD
Availability: BackOrder

Mahle MS Piston Set SBC 397ci 4.040in Bore 3.875in Stroke 6.0in Rod .927 Pin -5cc 11.5 CR Set of 8

$831.48

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 SBC 397ci 4.040in Bore 3.875in Stroke 6.0in Rod .927 Pin -5cc 11.5 CR Set of 8. Forged pistons for high-performance builds.

Key Features

Fits Chevrolet Small Block 397 cu in. engines.
Constructed from 4032 aluminum for strength and thermal expansion management.
Features a 4.040-inch bore size.
Includes a -5cc dish volume for a targeted 11.5:1 compression ratio.
Designed for use with a 3.875-inch stroke crankshaft and 6.0-inch connecting rods.
Utilizes a 0.927-inch pin diameter.

⚠️ 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

These Mahle MS forged pistons are built with 4032 aluminum, a material known for its strength and ability to handle the thermal expansion that comes with high-performance engine builds. With a 4.040-inch bore and a -5cc dish volume, they are designed to achieve an 11.5:1 compression ratio when paired with a 3.875-inch stroke crankshaft and a 6.0-inch connecting rod, making them a solid choice for a 397 cubic inch Small Block Chevrolet engine.

The pistons feature a 0.927-inch pin diameter, a common size for many performance applications. Each piston weighs in at 411 grams, which is a good balance for strength and rotational mass in a performance engine. Mahle's MS series pistons are a popular choice for builders looking for well-built components that can withstand the demands of a performance engine without breaking the bank. They are designed to fit right and perform reliably in your custom engine build.

This set includes eight pistons, enough for a complete V8 engine. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and break-in procedures to ensure optimal performance and longevity of your engine.