What is the compression ratio with these pistons?

These pistons have a 12cc dish volume. When used with appropriate cylinder heads and gaskets, they achieve an 11.9:1 compression ratio for your GM LS engine.

What material are these pistons made from?

The pistons are forged from 2618 aluminum. This material is chosen for its strength and ability to handle the high temperatures and pressures found in performance engine builds.

Can these pistons be shipped to California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle GM LS Forged Piston Set 4.005in Bore 197714805

Name: Mahle MS Piston Set GM LS 365ci 4.005in Bore 3.622stk 6.125in Rod .927 Pin 12cc 11.9 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-365ci-4-005in-bore-3-622stk-6-125in-rod-927-pin--t14-29207
Price: 1033.69 USD
Availability: BackOrder

Mahle MS Piston Set GM LS 365ci 4.005in Bore 3.622stk 6.125in Rod .927 Pin 12cc 11.9 CR Set of 8

$1033.69

On Backorder

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

Mahle GM LS forged piston set for 365ci engines. Features a 4.005in bore and 11.9:1 compression ratio.

Key Features

Fits GM LS 365 cubic inch engines.
Forged from 2618 aluminum for strength and durability.
Features a 4.005-inch bore size.
Designed for a 3.622-inch stroke and 6.125-inch connecting rod.
Includes a .927-inch wrist pin.
12cc dish volume results in an 11.9:1 compression ratio.

This piston set is designed for Chevrolet LS 365 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 a well-known name in the automotive industry, particularly for their expertise in engine components. This piston set is a prime example of their focus on performance and reliability for GM LS engines. If you're building or rebuilding a 365 cubic inch LS engine, these pistons are designed to handle the demands of a performance application.

This set features pistons with a 4.005-inch bore and a 3.622-inch stroke, designed for a 6.125-inch connecting rod and a .927-inch pin. They have a 12cc dish volume, which results in a 11.9:1 compression ratio when paired with the correct cylinder heads and gasket. The pistons themselves are forged from 2618 aluminum, a strong material commonly used in high-performance applications because it can withstand higher temperatures and pressures compared to cast aluminum. Each piston weighs in at 468 grams, contributing to a well-balanced rotating assembly.

This set includes eight pistons, enough for a complete engine build. Please note that these pistons are 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 guidelines for specific details on assembly and compatibility with other engine components.