What does the moly coating on the piston rings do?

The moly coating on the top ring helps to reduce friction between the ring and the cylinder wall. It also aids in the ring seating process, which is important for achieving good compression and oil control in performance engines.

What does '0.025 inch undersize' mean for these rings?

This means the rings are manufactured to be slightly smaller than the standard bore size for the specified engines. This is often used in engine rebuilding when cylinder walls have been honed to a specific, slightly smaller diameter.

Can these rings be shipped to California?

No, this product is not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle Piston Rings 3150004.025 - Chevy 396 400 402, Olds 425

Name: Mahle Rings Chevy Race 400 396 402 Engs Olds Race 425 455 Engs Moly Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-chevy-race-400-396-402-engs-olds-race-425-455-engs-moly-rin-t14-50404
Price: 166.72 USD
Availability: BackOrder

Mahle Rings Chevy Race 400 396 402 Engs Olds Race 425 455 Engs Moly Ring Set

$166.72

On Backorder

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

Mahle OE Moly Piston Ring Set 3150004.025 for Chevy 396, 400, 402 and Olds 425, 455 engines. Direct fit for performance builds.

Key Features

Fits Chevy 396, 400, and 402 cubic inch engines.
Fits Oldsmobile 425 and 455 cubic inch engines.
Moly coated top ring for reduced friction and improved seating.
Ring sizes: 1.5mm top ring, 1.5mm second ring, 3.0mm oil ring.
This is a 0.025 inch undersize ring set.

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Product Details

These Mahle Moly piston rings are built with a 1.5mm top ring, 1.5mm second ring, and a 3.0mm oil ring, a common setup for performance applications. They are designed to fit Chevy big-block engines like the 396, 400, and 402 cubic inch displacements, as well as Oldsmobile V8s including the 425 and 455 cubic inch engines. This specific set is 0.025 inches undersize, which is important to note for your rebuild.

The moly coating on the top ring helps reduce friction and wear, which is crucial for engines that see harder use. This coating also aids in seating the rings quickly against the cylinder walls, helping to maintain good compression and oil control. Mahle is a well-known name in engine components, and this set is a solid option for anyone rebuilding one of these classic performance V8s.

When rebuilding an engine, ensuring you have the correct ring set is key to proper sealing and longevity. This set is intended for race or performance builds and is not CARB approved, meaning it cannot be shipped to California.