Engines and Components› Camshafts and Valvetrain
Manley Performance
Manley Chevrolet LS1 And LT1 .800 Lift Valve Spring -1.324 Double (Single)
SKU: M004 221421-1
Easy — 1–2 hours
Description
Part #: 221421-1
Manley Valve Spring, SPRING-1.324 DOUBLE.
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
MIA's Description
These valve springs have a 1.324" outer diameter and a coil bind of 0.900". They offer a seat pressure of 165 lbs @ 1.800" and an open pressure of 515 lbs @ 1.000". The NexTek series has been tested by engine builders and confirmed to be high-performing.
Fitment
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Specifications
| Brand | Manley Performance |
| Part Number | M004 221421-1 |
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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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