What is the compression height of these pistons?

The compression height for these Mahle pistons is 1.125 inches. This measurement is critical for ensuring proper piston-to-head clearance and valve timing in your engine build.

What type of fuel is recommended for an engine using these pistons?

With a 12.3:1 compression ratio, these pistons are intended for high-performance applications that typically require high-octane racing fuel to prevent detonation. Always consult with your engine builder for specific fuel recommendations.

Are these pistons compatible with a standard 350ci crankshaft?

No, these pistons are specifically designed for a 377 cubic inch engine, which uses a 3.750-inch stroke crankshaft and a 6.0-inch connecting rod. Using them with a different crankshaft may result in incorrect compression and potential engine damage.

Mahle Forged Piston Set 4.155in Bore 12.3:1 CR 930212555

Name: Mahle Piston Set Chevy 400ci 4.155in Bore 3.750in Stroke 6.0in Rod 12.3:1 CR Piston Set of 8
Brand: Mahle
SKU: mahle-mahle-piston-set-chevy-400ci-4-155in-bore-3-750in-stroke-6-0in-rod-12-3-1--t14-96939
Price: 877.26 USD
Availability: BackOrder

Mahle Piston Set Chevy 400ci 4.155in Bore 3.750in Stroke 6.0in Rod 12.3:1 CR Piston Set of 8

$877.26

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 Chevy 377ci Small Block engines. 4.155in bore, 12.3:1 CR. Part# 930212555. Not CARB approved.

Key Features

Set includes eight forged pistons for Chevy 377 cu in. Small Block engines.
Features a 4.155 inch bore diameter.
Designed for a 12.3:1 compression ratio.
Constructed from strong 2618 aluminum alloy for high-performance durability.
Piston compression height is 1.125 inches.
Includes 0.927 inch wrist pins.

This piston set is designed for Chevrolet Small Block 377 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

Forged from 2618 aluminum alloy, this Mahle piston set is built for high-performance Chevy 377 cubic inch Small Block engines. The pistons feature a 4.155-inch bore and are designed to achieve a 12.3:1 compression ratio with a 3.750-inch stroke and a 6.0-inch connecting rod. Each piston weighs approximately 490 grams and has a 4.0cc volume dish, with a 1.125-inch compression height. This set includes eight pistons, ready for a serious engine build where power and durability are key.

Mahle's expertise in piston manufacturing is evident in the robust construction of these forged units. The 2618 aluminum alloy offers excellent strength and fatigue resistance, crucial for handling the high cylinder pressures and temperatures found in performance applications. The precise machining ensures a consistent fit and reliable operation, contributing to improved engine efficiency and power output. These pistons are designed to work with a 3.480/3.500-inch crankshaft stroke and a 6.125-inch connecting rod, with a 0.927-inch wrist pin diameter.

This piston set is intended for custom engine builds and requires careful attention to assembly details. Due to their high compression ratio, they are best suited for race applications or vehicles running high-octane fuel. Please note that this product is not CARB approved and cannot be shipped to California. Always consult your engine builder or Mahle's technical documentation for specific installation requirements and compatibility with other engine components.