Showing specs for all NA & NB Miatas

Cylinder block top face distortion — maximum (NA6)

Distortion: 0.006 in (0.15 mm) max.Distortion: 0.15 mm (0.006 in) max.

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Measure in the six factory-specified directions. Repair by grinding or replace the cylinder block if distortion exceeds specification.

Applies to
  • NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.
  • Verified in: 1990 Mazda MX-5 Miata Workshop Manual