Engines and Components› Pistons and Piston Rings
Manley Performance
SPRING CUP-OD 1.625
SKU: M004 42121-16
Moderate — 2–4 hours
Description
Designed for high-performance engines, these spring cups feature an outside diameter of 1.740 inches and an inside diameter of 0.635 inches. They are intended for use with valve springs that have an outside diameter of 1.625 inches.
Fitment
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Specifications
| Brand | Manley Performance |
| Part Number | M004 42121-16 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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