# Valve spring loaded height and load (NA8)

Canonical URL: https://miatatorque.com/spec/valve-spring-loaded-height-na8/

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

Confidence: fsm

Minimum length:
39.5mm {1.56 in} with a set load of
224—253 N {22.8—25.8 kgf, 50.2—56.7 lbf}

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-spring-loaded-height-na8",
  "name": "Valve spring loaded height and load (NA8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Other years inferred from 1994 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Minimum length:\n39.5mm {1.56 in} with a set load of\n224—253 N {22.8—25.8 kgf, 50.2—56.7 lbf}",
  "procedure": {
    "notes": "This is the source loaded-height/load specification, not a 39.5 mm unloaded free-length wear limit. Preserve its exact Minimum length wording."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "B–51 (PDF p. 88)",
      "as_printed": "Minimum length:\n39.5mm {1.56 in} with a set load of\n224—253 N {22.8—25.8 kgf, 50.2—56.7 lbf}",
      "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-spring-loaded-height-na8/"
}
```