What is the compression ratio with these pistons?

These pistons are designed to achieve a 10.0:1 compression ratio when used with compatible LS cylinder heads. The -4.5cc dish volume is a key factor in reaching this ratio.

What material are these pistons made from?

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

Are these pistons legal for use in California?

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

Mahle LSA/LS3/LS9 Piston Set 197813865

Name: Mahle GM LSA/LS3/LS9 376cid 4.065x1.299CH 3.622stk 6.125in Rod .927 Pin -4.5cc 10 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-gm-lsa-ls3-ls9-376cid-4-065x1-299ch-3-622stk-6-125in-rod-927-pin-4-5-t14-323726
Price: 1145.61 USD
Availability: BackOrder

Mahle GM LSA/LS3/LS9 376cid 4.065x1.299CH 3.622stk 6.125in Rod .927 Pin -4.5cc 10 CR Set of 8

$1145.61

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 GM LSA/LS3/LS9 376cid engines. 10.0 CR, 4.065 bore. Part# 197813865.

Key Features

Set of 8 forged pistons for GM LSA/LS3/LS9 376cid engines.
Designed to work with all LS heads.
Features a 4.065-inch bore and a -4.5cc dish volume.
Achieves a 10.0:1 compression ratio with compatible LS heads.
Constructed from 2618 aluminum for strength and heat resistance.
Compatible with 3.622-inch stroke and 6.125-inch rod length.

This piston set is designed for Chevrolet LS 376 cu in engines. Not CARB approved and cannot ship 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

If you're building or rebuilding a GM LSA, LS3, or LS9 engine with the 376 cubic inch displacement, this set of forged pistons from Mahle is a solid choice. These pistons are designed to work with all LS heads, making them a versatile option for your project. Mahle is a well-known name in engine components, and this set is built to handle the demands of performance applications.

Each piston in this set features a 4.065-inch bore and a -4.5cc dish volume, contributing to a 10.0:1 compression ratio when paired with compatible LS heads. The construction uses 2618 aluminum, a material chosen for its strength and ability to withstand high temperatures and pressures, which is crucial for boosted or high-performance naturally aspirated engines. The pistons have a 3.622-inch stroke compatibility, a 6.125-inch rod length, and a 0.927-inch pin diameter, ensuring precise fitment within the engine's rotating assembly. Each piston weighs in at 478 grams, contributing to a balanced rotating assembly.

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.