What is the compression ratio achieved with these pistons?

These Mahle MS pistons feature a -6cc dish, which helps achieve a compression ratio of approximately 8.9:1 when used with the specified stroke and rod length. This is a common target for many performance street and strip applications.

What material are these pistons made from and why is it important?

The pistons are made from 4032 aluminum. This material is chosen for its strength and ability to withstand the high temperatures and pressures found in a performance engine, offering good durability.

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 MS Piston Set SBF 4.040in Bore 930244140

Name: Mahle MS Piston Set SBF 307ci 4.040in Bore 3in Stroke 5.09in Rod .912 Pin -6cc 8.9 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbf-307ci-4-040in-bore-3in-stroke-5-09in-rod-912-pin-6-t14-29571
Price: 783.94 USD
Availability: BackOrder

Mahle MS Piston Set SBF 307ci 4.040in 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 308 cu in. 4.040in bore, -6cc dish. Set of 8.

Key Features

Fits Ford Small Block 308 cu in. engines.
4.040 inch bore size.
Features a -6cc dish for a 8.9:1 compression ratio.
Constructed from durable 4032 aluminum.
Includes pistons compatible with a 3.000 inch stroke and 5.090 inch rod.
Uses 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

Secure CheckoutFast Shipping631-982-0042

Product Details

If you're rebuilding the heart of your Ford Small Block engine, a solid set of pistons is crucial for performance and reliability. This Mahle MS Piston Set is built for the 308 cubic inch displacement, featuring a 4.040 inch bore size. These pistons are designed with a -6cc dish, which helps achieve a 8.9:1 compression ratio when paired with the specified stroke and rod length, making them a strong choice for many street and strip applications.

Mahle uses 4032 aluminum for these pistons, a well-known material for its strength and durability, especially under the heat and stress of combustion. They come in at 474 grams each, which is a reasonable weight for this type of performance piston. The set includes pistons with a 3.000 inch stroke compatibility and a 5.090 inch rod length, along with a .912 inch pin diameter, ensuring a precise fit for your rotating assembly. This attention to detail means you're getting a well-built component ready for the demands of a performance engine build.

This set comes with all eight pistons needed for a V8 engine. Please 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 assembly and tuning.