What is the compression ratio with these pistons?

These Mahle MS pistons feature a -6cc dish volume. When used with a 5.4-inch connecting rod and a 332 cubic inch displacement, they achieve a 9.6:1 compression ratio.

Are these pistons suitable for all Ford Small Block engines?

This specific piston set is designed for the 331 cubic inch Ford Small Block engine with a 4.030-inch bore. It's important to confirm your engine's exact displacement and bore size before purchasing.

What does the 'Not CARB approved' note mean?

This means the pistons do not meet California Air Resources Board (CARB) emissions standards. Consequently, they cannot be legally shipped to or installed on vehicles registered in California.

Mahle SBF 331ci Piston Set 4.030in Bore 930244530

Name: Mahle MS Piston Set SBF 331ci 4.030in Bore 3.25in Stroke 5.4in Rod .927 Pin -6cc 9.6 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbf-331ci-4-030in-bore-3-25in-stroke-5-4in-rod-927-pin-t14-29065
Price: 783.94 USD
Availability: BackOrder

Mahle MS Piston Set SBF 331ci 4.030in Bore 3.25in Stroke 5.4in Rod .927 Pin -6cc 9.6 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 SBF 331ci engines. Features a -6cc dish for a 9.6 CR.

Key Features

Fits Ford Small Block 331ci engines.
Constructed from durable 4032 aluminum.
Features a -6cc dish for a 9.6:1 compression ratio.
Piston weight is 413 grams for balanced performance.
Includes 0.927-inch wrist pins.
Compression height is 1.165 inches.

This piston set is designed for Ford Small Block 331 cubic inch 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

Mahle's MS Piston Set is built for the Ford Small Block 331ci engine, featuring a 4.030-inch bore and a 3.25-inch stroke. These pistons are crafted from 4032 aluminum, a material known for its strength and durability, making them a solid choice for performance builds. The -6cc dish volume contributes to a 9.6:1 compression ratio when paired with a 5.4-inch rod and a 332 cubic inch displacement, offering an improved balance of power and drivability for your engine.

Each piston weighs in at 413 grams, contributing to a well-balanced rotating assembly. The 0.927-inch pin diameter is standard for many performance applications, ensuring good compatibility with aftermarket connecting rods. Mahle has designed these pistons with a specific compression height of 1.165 inches, which is crucial for achieving the correct piston-to-deck clearance and optimizing combustion chamber volume. This attention to detail in design and material selection means you're getting a well-built component ready for serious use.

This set includes eight pistons, enough for a complete V8 engine. Please note that this piston set is not CARB approved and cannot be shipped to California. It also carries a Prop 65 warning. Ensure you consult with your engine builder or refer to Mahle's installation guidelines for proper fitment and assembly procedures to get the most out of this performance piston set.