Updated specs are available.
Valve length — standard and minimum (NA6)
This spec doesn't apply to the car you selected.
Not yet checked against the factory manual for your car's year. It's verified in the 1990 Mazda MX-5 Miata Workshop Manual; later manuals may differ.
Length Standard IN: 4.1452 in (105.29 mm) EX: 4.1492 in (105.39 mm) Minimum IN: 4.1256 in (104.79 mm) EX: 4.1295 in (104.89 mm)Length Standard IN: 105.29 mm (4.1452 in) EX: 105.39 mm (4.1492 in) Minimum IN: 104.79 mm (4.1256 in) EX: 104.89 mm (4.1295 in)
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure
IN means intake; EX means exhaust. Measure overall valve length.
Applies to
- NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.
- Verified in: 1990 Mazda MX-5 Miata Workshop Manual
Sources (1)
View 1 source citations
Page B–49 (PDF p. 76) · Printed value & notes
Part no. 1193-10-89CPage B–49 (PDF p. 76)Printed: “Length Standard IN: 105.29mm (4.1452 in) EX: 105.39mm (4.1492 in) Minimum IN: 104.79mm (4.1256 in) EX: 104.89mm (4.1295 in)”
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