What is the advantage of using forged pistons like these?

Forged pistons are made from a solid block of alloy that is heated and hammered into shape, making them significantly stronger and more durable than cast pistons. This allows them to withstand the higher cylinder pressures and temperatures found in performance or modified engines.

What does '+.020 Oversize' mean for my engine build?

This means the pistons are 0.020 inches larger in diameter than the standard bore size for your 6.1L Hemi. Your engine's cylinders will need to be precisely machined (honed) to this exact oversize dimension to ensure a proper fit and seal.

Are any other components included with these pistons?

This set includes eight pistons and eight premium chrome moly wrist pins. Ring sets are typically sold separately and should be chosen based on your specific engine build requirements.

Specifications

Brand: Manley Performance
Part #: 597660C-8
UPC: 807298061214

Manley Chrysler 6.1L Hemi 90.9mm Stroke 4.06in Bore +.020 Oversize 10.7:1 CR 5cc Dome Piston Set

Name: Manley Chrysler 6.1L Hemi 90.9mm Stroke 4.06in Bore +.020 Oversize 10.7:1 CR 5cc Dome Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-chrysler-6-1l-hemi-90-9mm-stroke-4-06in-bore-020-overs-t14-25229
Price: 1004.51 USD
Availability: BackOrder

$1004.51

On Backorder

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

Manley Chrysler 6.1L Hemi 90.9mm Stroke 4.06in Bore +.020 Oversize 10.7:1 CR 5cc Dome Piston Set. Forged from 2618 alloy for superior strength.

Key Features

Fits Chrysler 6.1L Hemi engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features a 4.06 inch bore and is +.020 inch oversize.
Designed with a 5cc dome for a 10.7:1 compression ratio.
Includes premium chrome moly wrist pins for added durability.
Exacting ring lands and grooves enhance ring seal for more power.

This piston set is designed for Chrysler 6.1L Hemi engines. Please verify fitment with your specific vehicle and 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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About this part

Product Details

If you're rebuilding the heart of your Chrysler 6.1L Hemi engine, a set of high-performance pistons is crucial for getting the most out of your build. These Manley Performance pistons are designed for serious engine work, offering a significant upgrade over stock components. They feature a 4.06-inch bore and are +.020 inches oversize, with a 90.9mm stroke and a 5cc dome that results in a 10.7:1 compression ratio, perfect for naturally aspirated or forced induction applications where increased power is the goal.

Manley uses domestic 2618 alloy forgings for these pistons, a material known for its exceptional strength and durability under high stress. This is important because forged pistons can handle the increased cylinder pressures and temperatures common in performance Hemi engines. They also come with premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring lands and skirt are perfectly square, which helps achieve a better ring seal and ultimately, more power. The pistons also feature proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls, even during aggressive operation.

This set includes eight pistons, each ready for your machine shop to hone the cylinders to the exact +.020 inch specification. Remember that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and break-in procedures.