What is the compression ratio with these pistons?

These Mahle pistons feature a 4.0cc dish volume, which results in a 12.2:1 compression ratio when used with the specified crankshaft stroke and rod length.

What material are these pistons made from?

The pistons are forged from 2618 aluminum. This material is chosen for its high strength and resistance to deformation under extreme engine conditions.

Are these pistons legal for use in California?

No, these pistons are not CARB approved and cannot be shipped to California due to their high compression ratio design.

Mahle Chevy 400ci Piston Set 930212525

Name: Mahle Piston Set Chevy 400ci 4.125in Bore 3.750in Stroke 6.0in Rod 12.2:1 CR Piston Set of 8
Brand: Mahle
SKU: mahle-mahle-piston-set-chevy-400ci-4-125in-bore-3-750in-stroke-6-0in-rod-12-2-1--t14-96938
Price: 877.26 USD
Availability: BackOrder

Mahle Piston Set Chevy 400ci 4.125in Bore 3.750in Stroke 6.0in Rod 12.2:1 CR Piston Set of 8

$877.26

On Backorder

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

Mahle Piston Set for Chevy 400ci (372 cu in) engines. Features a 4.125" bore and 12.2:1 compression ratio.

Key Features

Fits Chevrolet Small Block 400ci (372 cu in) engines.
Forged from 2618 aluminum for superior strength and durability.
Designed for a 4.125-inch bore.
Features a 4.0cc dish volume for a 12.2:1 compression ratio.
Intended for use with a 3.750-inch stroke crankshaft and 6.0-inch connecting rods.
Each piston weighs 478 grams.

This piston set is designed for Chevrolet Small Block 400ci (372 cu in) engines. Please verify compatibility with your specific engine build.

⚠️ 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 heart of your Chevrolet Small Block engine, specifically a 400ci (or 372 cu in variant), this Mahle piston set is built for serious performance. These aren't your average cast pistons; they're forged from 2618 aluminum, a material known for its strength and ability to handle high stress without deforming. This makes them ideal for builds that demand more power and durability than stock components can offer.

This set is engineered for a 4.125-inch bore and is designed to work with a 3.750-inch stroke crankshaft and a 6.0-inch connecting rod. The dish volume is a precise 4.0cc, resulting in a substantial 12.2:1 compression ratio. This higher compression will significantly increase the power output of your engine, especially when paired with appropriate camshafts and cylinder heads. Each piston weighs in at 478 grams, a testament to their robust construction while still managing weight for better engine response.

Keep in mind that due to their high compression ratio and specific design, these pistons are not CARB approved and cannot be shipped to California. This set includes pistons for a complete 8-cylinder engine. For optimal performance and longevity, ensure your engine build accounts for the increased cylinder pressures and heat generated by this high-compression setup.