What does 'file fit' mean for these piston rings?

File fit rings are designed so you can manually adjust the end gap to perfectly match your cylinder bore. This allows for a more precise seal compared to pre-gapped rings.

What are the dimensions of these rings?

This set includes a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring. The overall bore size is 4.065 inches, with a +.005 inch oversizing.

Can these rings be shipped to California?

No, these rings are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle Piston Ring Set MS 4.065in +.005in 4070MS-112

Name: Mahle MS 4.065in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-065in-005in-1-0mm-1-0mm-2-0mm-file-fit-rings-t14-29776
Price: 183.28 USD
Availability: BackOrder

Mahle MS 4.065in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

$183.28

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 4.065in +.005in file fit piston ring set. For engine rebuilding.

Key Features

This is a Mahle MS file fit piston ring set.
The set includes a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring.
Rings are sized at 4.065 inches with a +.005 inch oversizing for custom end gap adjustment.
File fit design allows for precise end gap tuning to match cylinder bore.
Suitable for custom engine builds and rebuilds where exact ring gap is critical.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

Product Details

If you're rebuilding the engine in your classic hot rod or a custom build, getting the piston rings seated correctly is crucial for performance and longevity. This Mahle MS file fit ring set is designed for builders who need precise control over ring end gap. The file fit design means you'll adjust the end gap yourself to perfectly match your cylinder bore, ensuring a tight seal and preventing blow-by.

This set features rings with specific dimensions: a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring. The +.005 inch sizing indicates these rings are slightly larger than standard, intended to be filed down to achieve the exact end gap required for your specific engine build. Mahle is a well-known name in engine components, and these rings are a solid option for a custom engine project where precise measurements matter.

Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for correct ring gap specifications and installation procedures.