What is the compression ratio achieved with these pistons?

These Mahle MS pistons feature a -16cc dish volume, which results in a 8.9:1 compression ratio when used with the specified 3.622-inch stroke and appropriate cylinder heads. This is ideal for many performance applications.

What material are these pistons made from and why is it important?

The pistons are forged from 2618 aluminum. This is a strong and durable alloy commonly used in high-performance pistons because it can reliably handle the high temperatures and pressures generated in demanding engine builds.

Are these pistons legal for use in California?

No, these pistons are not CARB approved and cannot be shipped to California. They also carry a Prop 65 warning.

Mahle GM LS 347ci Piston Set 930219005

Name: Mahle MS Piston Set GM LS 347ci 3.905in Bore 3.622stk 6.125in Rod .927 Pin -16cc 8.9 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-347ci-3-905in-bore-3-622stk-6-125in-rod-927-pin--t14-28999
Price: 882.30 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 347ci 3.905in Bore 3.622stk 6.125in Rod .927 Pin -16cc 8.9 CR Set of 8

$882.30

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 GM LS 347ci engines. Features a 3.905in bore and 8.9 CR for improved performance.

Key Features

Fits Chevrolet LS 347 cu in engines.
Forged from 2618 aluminum for strength and durability.
3.905 inch bore size.
Designed for a 3.622 inch stroke and 6.125 inch connecting rod.
.927 inch pin diameter.
-16cc dish volume for 8.9:1 compression ratio.

This piston set is designed for Chevrolet LS 347 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 is well-known for making solid engine components, and this MS Piston Set is a prime example of their work for GM LS engines. If you're building or rebuilding a 347 cubic inch LS engine, these pistons are designed to handle the demands of a performance build. They feature a 3.905-inch bore and are designed to work with a 3.622-inch stroke crankshaft and a 6.125-inch connecting rod, with a .927-inch pin diameter. This setup results in a compression ratio of 8.9:1 with the included -16cc dish volume, making them a good choice for naturally aspirated or forced induction applications where controlled compression is key.

These pistons are forged from 2618 aluminum, a strong material commonly used in high-performance pistons because it can withstand the high temperatures and pressures found in performance engines. Each piston weighs in at 413 grams, which is a reasonable weight for a forged piston of this size and strength. The specific dish volume of -16cc is crucial for achieving the target compression ratio, especially when paired with specific cylinder head volumes. Mahle designs these pistons with a 1.314-inch compression height, ensuring proper deck clearance when used with the specified stroke and rod length.

This set includes eight pistons, enough for a complete V8 engine. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially when dealing with critical engine components like pistons.