What is the compression ratio with these pistons?

These pistons have a -6.5cc dish volume. When used with other compatible engine components in a 306 cubic inch Ford Small Block, they achieve a compression ratio of 8.9:1.

Are these pistons suitable for all Ford Small Block engines?

This specific piston set is designed for Ford Small Block engines with a 306 cubic inch displacement and a 4.030 inch bore. Always verify your engine's specifications before purchasing.

Can these pistons be shipped to 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 930244130-1

Name: Mahle MS Piston Set SBF 306ci 4.030in Bore 3in Stroke 5.09in Rod .912 Pin -6cc 8.9 CR - SINGLE
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbf-306ci-4-030in-bore-3in-stroke-5-09in-rod-912-pin-6-t14-873374
Price: 86.91 USD
Availability: BackOrder

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

$86.91

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 SBF 306ci engines. Features 4.030in bore, 3in stroke, and 8.9 CR. Not CARB approved.

Key Features

Fits Ford Small Block 306 cu in engines.
4.030 inch bore size.
3.000 inch stroke.
-6.5cc dish volume for an 8.9:1 compression ratio.
5.090 inch connecting rod length.
0.912 inch pin diameter.

Designed for Ford Small Block 306 cu in engines. Not CARB approved and 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 rebuilding the engine in your Ford Small Block 306 cubic inch vehicle, a solid set of pistons is crucial for performance and reliability. This Mahle MS Piston Set is designed for that purpose, offering specific dimensions to match your engine's needs. They are built with 4032 aluminum, a material known for its good balance of strength and thermal expansion properties, which helps reduce piston slap and noise.

This set features a 4.030-inch bore and a 3-inch stroke, contributing to the 306 cubic inch displacement. The pistons are designed with a -6cc dish volume, working with the other engine components to achieve a 8.9:1 compression ratio. The 5.090-inch connecting rod length and a 0.912-inch pin diameter are standard specifications for many SBF applications. Each piston weighs in at 469 grams, which is a notable weight for this type of component.

Please be aware that these pistons are not CARB approved and cannot be shipped to California. Always refer to your vehicle's specific service manual for detailed installation procedures and torque specifications.