What is the compression ratio with these pistons?

These pistons feature a -28cc dish volume. When used with a 4.000 inch stroke crankshaft and appropriate head gasket and deck height, they achieve a 9.2:1 compression ratio.

What material are these pistons made from?

The pistons are forged from 2618 aluminum. This material is chosen for its strength and ability to withstand high temperatures and pressures commonly found in performance engines.

Are these pistons suitable for daily driving?

While forged from strong aluminum, these pistons are intended for performance engine builds. The 9.2:1 compression ratio is generally pump gas friendly for street performance, but suitability for daily driving depends on the overall engine combination and tuning.

Mahle Forged Piston Set SBM 408ci 4.03in Bore 930271130

Name: Mahle MS Piston Set SBM 408ci 4.03in Bore 4.00in Stroke 6.123in Rod .984 Pin -28cc 9.2 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-sbm-408ci-4-03in-bore-4-00in-stroke-6-123in-rod-984-pi-t14-29016
Price: 919.67 USD
Availability: BackOrder

Mahle MS Piston Set SBM 408ci 4.03in Bore 4.00in Stroke 6.123in Rod .984 Pin -28cc 9.2 CR Set of 8

$919.67

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle forged piston set for Small Block Mopar 408ci engines. 4.030" bore, 4.000" stroke, 9.2 CR. Set of 8.

Key Features

Fits Small Block Mopar (LA) 408 cubic inch engines.
Forged from 2618 aluminum for strength and durability.
4.030 inch bore size.
Designed for a 4.000 inch stroke and 6.123 inch connecting rod.
Features a -28cc dish volume for a 9.2:1 compression ratio.
Each piston weighs 487 grams.

This piston set is designed for Chrysler Small Block 408 cu in engines. It is not CARB approved and cannot be shipped 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

Mahle is a well-known name in engine components, trusted by many for their reliable parts. This piston set is built for Small Block Mopar (LA) engines, specifically for builds aiming for a 408 cubic inch displacement. If you're putting together a performance engine or rebuilding a classic Mopar, these pistons are designed to handle the demands of a larger displacement build.

This set features pistons with a 4.030 inch bore and are designed to work with a 4.000 inch stroke crankshaft and a 6.123 inch connecting rod. The dish volume is -28cc, which, when paired with the other dimensions, results in a 9.2:1 compression ratio. This compression ratio is a solid choice for many performance street applications, offering a good balance of power and pump gas compatibility. Each piston weighs in at 487 grams, which is a common weight for forged pistons of this size, contributing to good rotational balance.

These pistons are forged from 2618 aluminum, a material known for its strength and durability under high temperatures and pressures, making them suitable for performance builds. The pin diameter is 0.984 inches. Please note that this piston set is not CARB approved and cannot be shipped to California. It's always a good idea to consult with your engine builder or refer to Mahle's installation instructions for specific details regarding assembly and break-in procedures.