What is the compression ratio achieved with these pistons?

These pistons feature a 4cc dish volume which, when combined with the specified bore and stroke, results in a 13.4:1 compression ratio. This is suitable for high-performance applications using premium fuel.

Are these pistons suitable for all Small Block Chevy engines?

These pistons are specifically designed for 420 cubic inch displacement Chevrolet Small Block engines with a 4.155 inch bore. It's important to ensure this matches your engine build specifications.

What does 'Not CARB approved' mean for shipping?

This means the pistons do not meet California Air Resources Board emissions standards. Consequently, they cannot be legally shipped to California addresses.

Mahle SBC Piston Set 4.155in Bore 13.4 CR 930208655

Name: Mahle MS Piston Set SBC 420ci 4.155in Bore 3.875in Stroke 6.0in Rod .927 Pin 4cc 13.4 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbc-420ci-4-155in-bore-3-875in-stroke-6-0in-rod-927-pi-t14-29529
Price: 923.24 USD
Availability: BackOrder

Mahle MS Piston Set SBC 420ci 4.155in Bore 3.875in Stroke 6.0in Rod .927 Pin 4cc 13.4 CR Set of 8

$923.24

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 420ci SBC engines. Features 4.155in bore and 13.4 CR for improved performance.

Key Features

Fits Chevrolet Small Block 420 cu in. engines.
Forged from 2618 aluminum for strength and durability.
4.155 inch bore size.
3.875 inch stroke compatibility.
Designed for a 6.0 inch rod length.
Features a 0.927 inch pin diameter.

This piston set is designed for Chevrolet Small Block engines with a 420 cubic inch displacement. Not CARB approved; cannot ship to California.

⚠️ 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 building a high-performance Chevrolet Small Block engine to displace 420 cubic inches, a solid set of pistons is crucial for handling the increased power and stress. This Mahle MS Piston Set is designed specifically for that purpose, offering a well-built foundation for your engine's top end.

These pistons are forged from 2618 aluminum, a material known for its strength and ability to withstand high temperatures and pressures common in performance applications. With a 4.155-inch bore and a 3.875-inch stroke, they contribute to the 420 cubic inch displacement. The 6.0-inch rod length and 0.927-inch pin diameter are standard for many performance SBC builds. The 4cc dish volume combined with the bore and stroke results in a 13.4:1 compression ratio, which is ideal for naturally aspirated engines running on high-octane fuel, aiming for maximum power output. Each piston weighs approximately 470 grams, keeping rotating assembly weight manageable for good engine response.

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 consult your engine builder or a qualified professional for specific installation procedures and compatibility with your chosen camshaft, cylinder heads, and crankshaft to achieve your desired performance goals.