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Engines and Components› Camshafts and Valvetrain
Manley Performance
SPRING-1.620 DOUBLE
SKU: M004 221446SF-16
Advanced — 4+ hours
Overview
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Part #: 221446SF-16
From drag strips to short track and endurance circuits, the Manley NexTek (R) series is engineered for serious racers. NexTek (R) springs resist pressure loss and valve-train degradation even in the most demanding race conditions. That means more consistent spring force deep into a run, reduced valve bounce, and improved overall stability for high-RPM performance. Built to outperform and outlast in real-world competition.
Manley Valve Spring, SPRING-1.620 DOUBLE.
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- Valve float above 7000 RPM
- Loss of power at high RPM
- Misfire under heavy acceleration
- Inconsistent valve train noise
- Engine stumbles at redline
Relevant Conversations
- valve float at 7500 RPM fix
- best valve springs for LS drag race
- Manley NexTek vs PAC springs
- spring rate 575 lbs/in for high lift cam
- oval track valve spring upgrade
- P0300 random misfire at high RPM valve springs
- valve bounce after cam swap
- double valve spring install guide
- coil bind clearance 1.150" valve springs
- Manley 221446SF-16 review
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Manley Performance |
| Part Number | M004 221446SF-16 |
About MOTORMIA
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Returns & Fitment
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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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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