Showing specs for all NA & NB Miatas

Valve stem diameter (NA8)

Diameter IN: 0.2351—0.2356 in (5.970—5.985 mm) EX: 0.2349—0.2354 in (5.965—5.980 mm) Minimum IN: 0.2331 in (5.920 mm) EX: 0.2329 in (5.915 mm)Diameter IN: 5.970—5.985mm {0.2351—0.2356 in} EX: 5.965—5.980mm {0.2349—0.2354 in} Minimum IN: 5.920mm {0.2331 in} EX: 5.915mm {0.2329 in}

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Measure each stem at the factory-specified points.

Applies to
  • NA 1994–1997 (BP) — Other years inferred from 1994 factory evidence.
  • Verified in: 1994 Mazda MX-5 Miata Workshop Manual

Sources (1)

View 1 source citations
  • 1994 Mazda MX-5 Miata Workshop ManualTier 1
    Page B–48 (PDF p. 85) · Printed value & notes
    Page B–48 (PDF p. 85)
    Printed: “Diameter IN: 5.970—5.985mm {0.2351—0.2356 in} EX: 5.965—5.980mm {0.2349—0.2354 in} Minimum IN: 5.920mm {0.2331 in} EX: 5.915mm {0.2329 in}”

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