What is the compression ratio with these pistons?

With a 4.280 inch bore, 4.250 inch stroke, and 43cc dome volume, these pistons achieve a 12.8:1 compression ratio. This is suitable for high-performance applications.

What material are these pistons made from?

These pistons are constructed from 2618 aluminum. This is a strong and durable alloy commonly used in high-performance and racing pistons due to its ability to handle high temperatures and pressures.

Are these pistons legal for use in California?

No, these pistons are not CARB approved and cannot be shipped to California. They are intended for competition or off-road use where emissions regulations may differ.

Mahle BBC Piston Set 4.280in Bore 12.8 CR 929906780

Name: Mahle MS Piston Set BBC 489ci 4.280in Bore 4.25in Stroke 6.385in Rod .990 Pin 43cc 12.8 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bbc-489ci-4-280in-bore-4-25in-stroke-6-385in-rod-990-p-t14-191517
Price: 998.57 USD
Availability: BackOrder

Mahle MS Piston Set BBC 489ci 4.280in Bore 4.25in Stroke 6.385in Rod .990 Pin 43cc 12.8 CR Set of 8

$998.57

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 BBC 489ci engines. 4.280in bore, 12.8 CR, 6.385in rod. Part# 929906780. Not CARB approved.

Key Features

Fits Chevy Big Block 489 cu in engines.
Piston set includes 8 pistons.
Features a 4.280 inch bore size.
Designed for a 4.250 inch stroke.
Includes 6.385 inch connecting rods and 0.990 inch pins.
43cc dome volume results in a 12.8:1 compression ratio.

This piston set is designed for Chevy Big Block 489 cubic inch engines with a standard deck height. It is not CARB approved and cannot be shipped 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

Mahle is a well-known name in engine components, often supplying parts for original equipment manufacturers. This Mahle MS Piston Set is built for Big Block Chevy 489 cubic inch engines, specifically designed for a standard deck height of 9.800 inches. These pistons are a key component for rebuilding or upgrading your engine's top end, directly impacting its performance and efficiency.

This set features pistons with a 4.280-inch bore and a 4.250-inch stroke, paired with 6.385-inch connecting rods and a 0.990-inch pin. The dome volume is 43cc, which results in a 12.8:1 compression ratio with the specified bore and stroke. They are constructed from 2618 aluminum, a strong material commonly used for high-performance pistons due to its durability and ability to withstand high temperatures and pressures. Each piston weighs 583 grams, contributing to a balanced rotating assembly. This set includes eight pistons, enough for a complete V8 engine build.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's specifications and the manufacturer's installation instructions for proper fitment and assembly procedures. This set is intended for competition or off-road use where emissions regulations may differ.