Updated specs are available.
Valve overall length (NA8)
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 1994 Mazda MX-5 Miata Workshop Manual; later manuals may differ.
Length Standard IN: 4.0114 in (101.89 mm) EX: 4.0153 in (101.99 mm) Minimum IN: 3.9524 in (100.39 mm) EX: 3.9563 in (100.49 mm)Length Standard IN: 101.89mm {4.0114 in} EX: 101.99mm {4.0153 in} Minimum IN: 100.39mm {3.9524 in} EX: 100.49mm {3.9563 in}
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure
Measure each valve length; intake and exhaust differ.
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: “Length Standard IN: 101.89mm {4.0114 in} EX: 101.99mm {4.0153 in} Minimum IN: 100.39mm {3.9524 in} EX: 100.49mm {3.9563 in}”
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