# Valve stem-to-guide clearance (NA8)

Canonical URL: https://miatatorque.com/spec/valve-stem-guide-clearance-na8/

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

Confidence: fsm

Clearance
IN: 0.005—0.060mm {0.0002—0.0023 in}
EX: 0.010—0.065mm {0.0004—0.0025 in}
Maximum: 0.20mm {0.008 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-stem-guide-clearance-na8",
  "name": "Valve stem-to-guide clearance (NA8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Other years inferred from 1994 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Clearance\nIN: 0.005—0.060mm {0.0002—0.0023 in}\nEX: 0.010—0.065mm {0.0004—0.0025 in}\nMaximum: 0.20mm {0.008 in}",
  "procedure": {
    "notes": "Calculate each corresponding guide inside diameter minus valve-stem outside diameter. Replace valve and/or guide if outside specification."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "B–48 (PDF p. 85)",
      "as_printed": "Clearance\nIN: 0.005—0.060mm {0.0002—0.0023 in}\nEX: 0.010—0.065mm {0.0004—0.0025 in}\nMaximum: 0.20mm {0.008 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-stem-guide-clearance-na8/"
}
```