Dual valve spring kit

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ON BACKORDER, ETA Mar 19, 2021
Part number
For the most extreme Miata engine builds - with titanium retainers. Ooooo.

For the most extreme Miata engine. If you're building a track car, 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 NA and NB Miatas. NA valves will require the use of valve keepers from a NB engine (not included).

Head Diam Pressure (lbs@mm) Max lift Coil Bind Rate
O.D. (mm) I.D. (mm) Seat Open (lift) mm mm lbs./mm
1994-05 27.50 15.20 74 @ 34.2 177 @ 10.5 11.50 20.70 12.1
More Information
Part number M04-66602
Designed for model year: 1997
Fits Exocet? No
California emissions No information at this time
Manufacturer Supertech
Proposition 65 Warning: Cancer and reproductive harm
Flyin' Miata exclusive No
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