What is a gapless top piston ring?

A gapless top piston ring is designed without a traditional gap. This creates a continuous seal around the piston, preventing combustion gases from escaping past the ring into the crankcase. This improved seal helps maintain cylinder pressure for better performance and can reduce oil consumption.

What are the dimensions of these rings?

This set features a 1.5mm thickness for the gapless top ring and a 3.0mm thickness for the second ring. These dimensions are specific to the piston groove size they are intended to fit.

Are these rings suitable for all engine builds?

These gapless top rings are particularly beneficial for high-performance, boosted, or high-compression engines where maintaining cylinder integrity under extreme pressure is critical. For standard or mild builds, conventional rings might suffice, but these offer an improved seal for demanding applications.

Specifications

Brand: Manley Performance
Part #: 46360GT-8
UPC: 807298072043

Manley Piston Ring, RING-4.125/4.130 1.5,3mm GAPLESS TOP

Name: Manley Piston Ring, RING-4.125/4.130 1.5,3mm GAPLESS TOP
Brand: Manley Performance
SKU: manley-performance-manley-piston-ring-ring-4-125-4-130-1-5-3mm-gapless-top-t14-881319
Price: 666.12 USD
Availability: BackOrder

$666.12

On Backorder

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

Manley Performance gapless top piston ring set for 4.125"/4.130" bore. Features a 1.5mm, 3mm gapless top ring design.

Key Features

Fits engines with a 4.125" or 4.130" bore.
Features a 1.5mm gapless top ring for improved sealing.
Includes a 3.0mm second ring.
Minimizes combustion blow-by for increased efficiency and power.
Well-built for high-performance and demanding engine applications.

This piston ring set is designed for engines with a 4.125" or 4.130" bore. 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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About this part

Product Details

This is a Manley Performance gapless top piston ring set, designed for engines with a bore size of 4.125 inches or 4.130 inches. The key feature here is the gapless top ring, which is a significant upgrade for high-performance applications. Unlike conventional rings that have a gap, this design creates a continuous seal around the piston. This improved seal helps prevent combustion gases from blowing past the piston into the crankcase, a phenomenon known as blow-by. By minimizing blow-by, you can expect better cylinder pressure, which translates to more efficient power delivery and can help reduce oil consumption.

Manley has engineered these rings with specific dimensions: a 1.5mm thickness for the top ring and a 3.0mm thickness for the second ring. This sizing is critical for proper fitment within the piston groove and for achieving the intended sealing performance. The gapless design is particularly beneficial in boosted or high-compression engines where maintaining cylinder integrity under extreme pressure is paramount. These rings are well-built and intended for builders who are serious about maximizing engine performance and durability. They are a popular choice when rebuilding or modifying engines for demanding use.

When installing these rings, pay close attention to the manufacturer's specifications for piston groove clearance and ring seating. Proper installation is crucial for the gapless design to function as intended and to ensure the longevity of your engine build. Please note that this part is not CARB approved and cannot be shipped to California. It also falls under California's Proposition 65 warning requirements.