What is the compression ratio achieved with these pistons?

These Mahle pistons feature a -12cc dish volume. When used with the specified bore and stroke, they achieve a 10.0 compression ratio. This is ideal for many performance Hemi applications.

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

The pistons are constructed from 4032 aluminum. This alloy is chosen for performance applications because it offers a strong yet lightweight option, with good thermal expansion characteristics suitable for high-RPM and high-load engine operation.

Are these pistons compatible with all Hemi engines?

This specific piston set is designed for 420 cubic inch Hemi engines and includes specifications for bore, stroke, rod length, and pin size. It's important to confirm these dimensions match your engine build before purchasing.

Mahle Hemi Piston Set 4.065in Bore 930277565

Name: Mahle MS Piston Set Hemi 420ci 4.065in Bore 4.05in Stk 6.125in Rod .927 Pin -12cc 10.0 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-hemi-420ci-4-065in-bore-4-05in-stk-6-125in-rod-927-pin-t14-29018
Price: 972.44 USD
Availability: BackOrder

Mahle MS Piston Set Hemi 420ci 4.065in Bore 4.05in Stk 6.125in Rod .927 Pin -12cc 10.0 CR Set of 8

$972.44

On Backorder

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

Mahle Hemi 420ci forged piston set. 4.065in bore, 10.0 CR, .927in pin. Part# 930277565. Not CARB approved.

Key Features

Fits Chrysler Hemi 420 cu in engines.
Mahle MS forged piston set.
4.065 inch bore size.
Designed for a 4.050 inch stroke and 6.125 inch connecting rod.
Features a -12cc dish volume for a 10.0 compression ratio.
Utilizes a .927 inch wrist pin.

This piston set is designed for Chrysler Hemi 420 cubic inch engines. Please verify compatibility with your specific engine build.

⚠️ 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 engine components, recognized for their robust manufacturing and reliable parts. This piston set is built for high-performance Hemi engines, specifically those displacing 420 cubic inches. If you're rebuilding or upgrading a Hemi, these pistons are designed to handle the demands of a performance build, offering a solid foundation for increased power and durability.

This set features pistons with a 4.065-inch bore and are designed to work with a 4.050-inch stroke and a 6.125-inch connecting rod. The dish volume is -12cc, which helps achieve a 10.0 compression ratio with the specified bore and stroke. They use a .927-inch pin, a common size for performance applications. Constructed from 4032 aluminum, these pistons offer a good balance of strength and lighter weight, which is crucial for high-RPM operation. The 4032 alloy is known for its good thermal expansion properties, making it suitable for performance street and strip applications where consistent operation under load is important.

This is a complete set of 8 pistons, ready for installation. Please note that these pistons are not CARB approved and cannot be shipped to California. Ensure you consult your engine builder or a qualified mechanic for proper installation and tuning to maximize the performance and longevity of your Hemi engine with these Mahle pistons.