What is the intended compression ratio with these pistons?

These Mahle MS pistons are designed to achieve a compression ratio of approximately 9.8:1. This figure can vary based on the cylinder head volume and head gasket thickness used in your build.

What materials are these pistons made from?

The pistons are constructed from 2618 aluminum, a well-known material for its strength and durability in high-performance engine applications.

Are these pistons compatible with all LS engines?

This set is specifically for GM LS 365 cubic inch engines with a 4.005-inch bore. It's crucial to verify your engine's specifications and consult Mahle's fitment guide to ensure compatibility before purchase.

Mahle GM LS Piston Set 4.005in Bore 930225405

Name: Mahle MS Piston Set GM LS 365ci 4.005in Bore 3.622in Stk 6.125in Rod .927 Pin -12cc - Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-ls-365ci-4-005in-bore-3-622in-stk-6-125in-rod-927-p-t14-848086
Price: 860.80 USD
Availability: BackOrder

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

$860.80

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 365ci engines. 4.005in bore, -12cc dish. Set of 8.

Key Features

Set of 8 Mahle MS pistons for GM LS 365ci engines.
4.005 inch bore size.
Features a -12cc dish for specific compression ratio tuning.
Designed for a 3.622 inch stroke and 6.125 inch connecting rod.
Utilizes a .927 inch pin diameter.
Constructed from 2618 aluminum for strength.

⚠️ 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 MS Piston Set for GM LS 365ci engines. This set includes eight pistons designed for a 4.005-inch bore and features a -12cc dish, which is important for achieving a specific compression ratio. These pistons are built for performance applications where durability and precise engine operation are key.

Crafted from 2618 aluminum, these pistons are well-built for high-stress environments. They have a 3.622-inch stroke compatibility and are designed to work with a 6.125-inch connecting rod, featuring a .927-inch pin diameter. The pistons weigh 432 grams each, contributing to a balanced rotating assembly. This set is intended for builders looking to assemble or rebuild a robust LS engine, aiming for a compression ratio around 9.8:1 depending on other engine components.

This piston set is a solid option for performance engine builds. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to Mahle's installation instructions for proper fitment and assembly procedures, especially regarding ring installation and pin fitting.