What is the compression ratio with these pistons?

These pistons feature a -6cc dish volume. When used with appropriate cylinder heads and head gaskets for a 306 cubic inch Ford Small Block, they will result in a compression ratio of approximately 8.9:1.

What material are these pistons made from?

The pistons are forged from 4032 aluminum. This material is chosen for its strength, durability, and favorable thermal expansion characteristics, making it suitable for high-performance engine applications.

Are these pistons legal for use in California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle SBF 306ci Piston Set 4.030in Bore 930244130

Name: Mahle MS Piston Set SBF 306ci 4.030in Bore 3in Stroke 5.09in Rod .912 Pin -6cc 8.9 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbf-306ci-4-030in-bore-3in-stroke-5-09in-rod-912-pin-6-t14-29570
Price: 783.94 USD
Availability: BackOrder

Mahle MS Piston Set SBF 306ci 4.030in Bore 3in Stroke 5.09in Rod .912 Pin -6cc 8.9 CR Set of 8

$783.94

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 Ford Small Block 306ci engines. 4.030in bore, -6cc dish, 8.9 CR. Set of 8.

Key Features

Fits Ford Small Block 306 cu in. engines.
Forged from 4032 aluminum for strength and thermal stability.
4.030 inch bore size.
-6cc piston dish volume for an 8.9:1 compression ratio.
Designed for a 3.000 inch stroke and 5.090 inch connecting rod.
Includes a .912 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

If you're rebuilding the heart of your Ford Small Block 306ci engine, a solid set of pistons is crucial for performance and reliability. This Mahle MS Piston Set is built for that job, featuring a 4.030-inch bore and a 3-inch stroke, designed to work with a 5.090-inch connecting rod. These pistons are forged from 4032 aluminum, a material known for its strength and good thermal expansion properties, which helps them hold up under demanding conditions while maintaining a good seal.

Each piston in this set has a -6cc dish volume, contributing to a compression ratio of 8.9:1 when paired with the right cylinder heads and gasket. This ratio is a popular choice for street performance builds, offering a good balance of power and pump gas compatibility. The pistons come with a .912-inch pin diameter, a common size for many performance connecting rods. Mahle is a well-known name in engine components, and this set reflects their commitment to well-built parts for serious engine work.

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 fitment and assembly procedures, especially regarding ring gap and pin fitting.