# Cylinder block resurfacing removal — maximum (NA6)

Canonical URL: https://miatatorque.com/spec/cylinder-block-grinding-limit-na6/

Applicability: NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.

Confidence: fsm

Height: 221.5 mm (8.720 in)
Grinding: 0.20 mm (0.008 in) max.

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": "cylinder-block-grinding-limit-na6",
  "name": "Cylinder block resurfacing removal — maximum (NA6)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1993
      ],
      "engines": [
        "B6"
      ],
      "note": "Other years inferred from 1990 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Height: 221.5 mm (8.720 in)\nGrinding: 0.20 mm (0.008 in) max.",
  "procedure": {
    "notes": "The published block height and maximum removal are separate measurements; this is not a calculated minimum block height."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "B–54 (PDF p. 81)",
      "as_printed": "Height: 221.5mm (8.720 in)\nGrinding: 0.20mm (0.008 in) max.",
      "verified_years": [
        1990,
        1990
      ],
      "document": {
        "id": "fsm-1990",
        "tier": 1,
        "title": "1990 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1193-10-89C",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1990,
              1990
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "url": "https://archive.org/details/1990-mazda-mx-5-miata-workshop-manual_202411"
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/cylinder-block-grinding-limit-na6/"
}
```