What is the compression ratio with these pistons?

These Mahle pistons are designed to achieve an 11.9:1 compression ratio when used with appropriate cylinder heads and a 4.375-inch stroke crankshaft. This is suitable for high-performance applications.

Are these pistons suitable for all Chrysler Big Block engines?

This specific set is designed for 520 cubic inch displacement with a 4.350-inch bore and 4.375-inch stroke. While for Chrysler Big Blocks, you must confirm these exact dimensions match your engine build.

What is included with this piston set?

This set includes eight pistons, along with the necessary wrist pins and locks for installation. Rings are typically sold separately and should be chosen based on your specific application and bore size.

Mahle Forged Piston Set 4.350in Bore 11.9 CR 929962450

Name: Mahle MS Piston Set BBM 520ci 4.350in Bore 4.375in Stroke 7.1in Rod 0.990 Pin -8cc 11.9 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bbm-520ci-4-350in-bore-4-375in-stroke-7-1in-rod-0-990--t14-191490
Price: 886.31 USD
Availability: BackOrder

Mahle MS Piston Set BBM 520ci 4.350in Bore 4.375in Stroke 7.1in Rod 0.990 Pin -8cc 11.9 CR Set of 8

$886.31

On Backorder

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

Mahle 520ci forged piston set for Chrysler Big Block. 4.350in bore, 11.9 CR, 0.990in pin.

Key Features

Fits Chrysler Big Block 520 cu in. engines.
Constructed from durable 4032 aluminum alloy.
Features a 4.350-inch bore and 4.375-inch stroke.
Includes -8.1cc valve reliefs for ample valve clearance.
Achieves an 11.9:1 compression ratio.
Utilizes a 0.990-inch wrist pin diameter.

This piston set is designed for Chrysler Big Block 520 cu in. engines. Please verify compatibility with your specific 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

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Product Details

Built from 4032 aluminum alloy, these Mahle MS pistons are designed for high-performance Chrysler Big Block engines. The 4.350-inch bore and 4.375-inch stroke dimensions are specific to 520 cubic inch applications, and the 7.1-inch rod length works with a 4.375-inch stroke to achieve the correct piston deck height.

The -8.1cc valve reliefs are precisely machined to accommodate significant valve lift, crucial for engines with aggressive camshaft profiles and high compression. With an 11.9:1 compression ratio, these pistons are intended for naturally aspirated or forced induction builds where maximum power is the goal. The 0.990-inch wrist pin diameter is a common size for many performance connecting rods, ensuring broad compatibility. Each piston weighs approximately 509 grams, contributing to a well-balanced rotating assembly.

This set includes eight pistons, all necessary hardware for installation, and is a well-built component for serious engine builds. 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 fitment and assembly procedures.