# Valve guide inner diameter (NA8)

Canonical URL: https://miatatorque.com/spec/valve-guide-inner-diameter-na8/

Applicability: NA 1994–1997 (BP) — Other years inferred from 1994 factory evidence.

Confidence: fsm

Inner diameter
IN: 5.99—6.03mm {0.2359—0.2374 in}
EX: 5.99—6.03mm {0.2359—0.2374 in}

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "valve-guide-inner-diameter-na8",
  "name": "Valve guide inner diameter (NA8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Other years inferred from 1994 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Inner diameter\nIN: 5.99—6.03mm {0.2359—0.2374 in}\nEX: 5.99—6.03mm {0.2359—0.2374 in}",
  "procedure": {
    "notes": "Measure each guide at specified points."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "B–48 (PDF p. 85)",
      "as_printed": "Inner diameter\nIN: 5.99—6.03mm {0.2359—0.2374 in}\nEX: 5.99—6.03mm {0.2359—0.2374 in}",
      "verified_years": [
        1994,
        1994
      ],
      "document": {
        "id": "fsm-1994",
        "tier": 1,
        "title": "1994 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1994,
              1997
            ],
            "engines": [
              "BP"
            ]
          }
        ],
        "note": "Mazda's base manual for 1994–97; later model years got supplements, which we haven't checked yet."
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/valve-guide-inner-diameter-na8/"
}
```