What is the compression ratio with these pistons?

These Mahle pistons feature an 8.5cc dome volume, which results in a 11.5:1 compression ratio when used with compatible LS1/2/6 style cathedral port heads. This ratio is suitable for many performance builds on pump gas.

Are these pistons suitable for all LS engines?

This specific set is designed for Chevrolet LS engines with a 5.3L displacement and a 3.790-inch bore, commonly referred to as 327cid. They are intended for use with LS1/2/6 style cathedral port heads. It's always best to verify fitment with your exact engine configuration.

What does 'Not CARB approved' mean for shipping?

This means the pistons do not meet California Air Resources Board (CARB) emissions standards. Consequently, they cannot be legally shipped to California due to emissions regulations.

Mahle LS Piston Set 3.790in Bore 930220090

Name: Mahle MS Chevrolet LS 5.3L 327cid 3.790in Bore x 1.304CH 3.622 Stroke 8.5cc 11.5 CR - Pist Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-chevrolet-ls-5-3l-327cid-3-790in-bore-x-1-304ch-3-622-stroke-8-5c-t14-350889
Price: 954.61 USD
Availability: BackOrder

Mahle MS Chevrolet LS 5.3L 327cid 3.790in Bore x 1.304CH 3.622 Stroke 8.5cc 11.5 CR - Pist Set of 8

$954.61

On Backorder

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

Mahle MS Chevrolet LS 5.3L 327cid forged piston set. 3.790in bore, 11.5 CR.

Key Features

Set of 8 forged pistons for Chevrolet LS 5.3L engines.
3.790 inch bore size.
3.622 inch stroke.
8.5cc dome volume.
11.5:1 compression ratio.
0.927 inch pin diameter.

This piston set is designed for Chevrolet LS engines with a 327 cubic inch displacement. Always confirm compatibility with your specific engine build and cylinder heads.

⚠️ 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 rebuilding the engine in your Chevrolet LS 5.3L, a solid set of pistons is crucial for performance and reliability. This set from Mahle is built for LS1/2/6 style cathedral port heads, making it a direct fit for many popular LS engine builds. These aren't just any pistons; they're forged from 2618 aluminum, a material known for its strength and ability to handle high cylinder pressures and temperatures, which is essential for any performance-oriented engine.

Mahle has engineered these pistons with a 3.790-inch bore and a 3.622-inch stroke, contributing to the 327 cubic inch displacement. The 8.5cc dome volume and 11.5:1 compression ratio are designed to work well with cathedral port heads, aiming for an improved power output without being overly aggressive for pump gas in many applications. The 0.927-inch pin size is standard for many LS applications, and the overall weight of 443 grams per piston is competitive for forged units, helping to keep the rotating assembly balanced.

This set includes eight pistons, enough for a complete V8 engine. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For a successful installation, always refer to the manufacturer's detailed specifications and recommended assembly procedures, especially regarding ring gap, piston-to-wall clearance, and proper lubrication.