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Dual valve spring kit

Dual valve spring kit

Regular price $569.00 USD
Regular price Sale price $569.00 USD
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For the most extreme Miata engine. If you're building a track car and are planning on extended run time above 7500 rpm or boost 18 psi or more - they're what you need.

Aluminum spring seat, chrome silicon steel springs, and titanium retainer. Sold in sets of 16 for a complete head. Fits all BP (1.8L) engines in both NA and NB Miatas. NA valves will require the use of valve keepers from an NB engine (not included).

  • Seat pressure: 85 lb @ 33.60 mm
  • Open pressure: 205 lb @ 10 mm
  • Max lift: 12.90 mm
  • Coil bind: 20.70 mm


Instructions are not currently available.


Ships free in the US.

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What does it fit?


Emissions do not apply.


30 days