What is the compression ratio achieved with this piston set?

This Mahle piston set is designed to achieve a 10.9:1 compression ratio when used in a Ford Small Block 383 cubic inch engine with a 4.030-inch bore and a 3.750-inch stroke. The -6.5cc dish on the flat-top piston contributes to this ratio.

What material are these pistons made from?

These pistons are constructed from 4032 aluminum alloy. This material is chosen for its strength and durability, making it suitable for performance engine applications.

Are these pistons legal for use in California?

No, this piston set is not CARB approved and cannot be shipped to California. Please check local regulations regarding engine component legality.

Mahle 383ci SB Piston Set 4.030in Bore Flat Top -6cc 10.9 CR

Name: Mahle MS Piston Set Ford Flat Top SB 383ci 4.030in Bore 3.75in Stk 6.2in Rod .927 Pin -6cc 10.9 CR
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-ford-flat-top-sb-383ci-4-030in-bore-3-75in-stk-6-2in-r-t14-131411
Price: 783.94 USD
Availability: BackOrder

Mahle MS Piston Set Ford Flat Top SB 383ci 4.030in Bore 3.75in Stk 6.2in Rod .927 Pin -6cc 10.9 CR

$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 383ci engines. Flat top pistons, 4.030in bore, 10.9 CR. Part# 930173130.

Key Features

Fits Ford Small Block 383 cu in. engines.
4.030 inch bore diameter.
3.750 inch stroke compatibility.
Flat top piston design with -6.5cc dish.
Achieves 10.9:1 compression ratio.
Constructed from 4032 aluminum alloy.

This piston set is designed for Ford Small Block 383 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

If you're building a Ford Small Block engine and aiming for a specific compression ratio, this Mahle MS Piston Set is a solid choice. Designed for a 383 cubic inch displacement with a 4.030-inch bore and a 3.750-inch stroke, these pistons are engineered to work with a 6.200-inch rod and feature a standard .927-inch pin. The flat-top design, combined with a -6.5cc dish, helps achieve a 10.9:1 compression ratio, which is ideal for many performance street and strip applications when paired with the right cylinder heads.

Mahle uses 4032 aluminum alloy for these pistons, a material known for its strength and durability, making them well-suited for the demands of a performance engine. Each piston weighs in at approximately 407 grams, contributing to a balanced rotating assembly. The precision in their manufacturing ensures that these pistons will fit right and perform reliably, providing a strong foundation for your engine build. This set is specifically for Ford Small Block applications and is not CARB approved, meaning it cannot be shipped to California.