Showing specs for all NA & NB Miatas

Cylinder head resurfacing removal — maximum (NA6)

Grinding: 0.008 in (0.20 mm) max.Grinding: 0.20 mm (0.008 in) max.

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

Observe the separate head-height specification and check valve seats, manifold surfaces and camshaft clearances before resurfacing.

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