MAHLE Performance Napier Second Compression Ring 4.180in Bore .043in 48-Pack
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This item may be on backorder. Please contact us to confirm supplier availability and estimated lead time before ordering.
Regular price
$868.83
Verified Fitment & Application Support
This product is selected for proper fitment and compatibility with the listed engine application. Our team is available to assist with fitment questions, installation considerations, and supporting components to ensure a smooth install and reliable performance.
Got Questions? Feel free to email us or call us at (503) 235-1947
Compliance & Restrictions
California Proposition 65 (Prop 65)
WARNING: This product can expose you to chemicals which is known to the State of California to cause cancer and/or reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
CARB / California Emissions Compliance
This item may be restricted in California and other regions with emissions regulations. If applicable, it is intended for
competition/off-road use only unless otherwise stated. It is the customer’s responsibility to confirm local compliance before purchase.
Orders shipping to restricted areas may be canceled.
MAHLE Performance 302-1258B is a second compression ring for 4.180in bore, .043in in axial height. It is built from steel.
Key Features
- Second ring duty is roughly 80% oil control and up to 20% compression control
- The Napier tapered hook groove profile scrapes oil from the cylinder wall on the downstroke and rides on an oil film on the upstroke. It also acts as a check valve, relieving combustion pressure that builds under the top ring and helping keep that ring stable.
- Supplied as a bulk open-stock pack of 48 rings
Product Details
- Brand: MAHLE Performance
- Product type: Second Compression Ring
- Bore diameter: 4.180 in
- Axial height: .043in
- Radial wall thickness: .135 in
- Ring type: THM-13
- Position: Lower compression ring (second)
- Pack quantity: 48
- Manufacturer Part Number: 302-1258B
Shipping Height: 3.25
Shipping Length: 5.0
Shipping Width: 5.0