{
  "$schema": "https://austin-hood.4ort.net/schema/engine-specs.json",
  "engine": {
    "designation": "Ford Small Block 289",
    "displacement_liters": 4.73,
    "displacement_cubic_inches": 289,
    "configuration": "V8",
    "bore_inches": 4.000,
    "stroke_inches": 3.700,
    "compression_ratio_gt": "10.5:1",
    "horsepower_sae_net": 271,
    "rpm_peak_hp": 6000,
    "block_material": "cast_iron",
    "heads_material": "aluminum_casting_3C",
    "year_application": [1964, 1965],
    "model_application": "Mustang_GT"
  },
  "carburetor": {
    "make": "Holley",
    "series": "4150",
    "flow_rating_cfpm": 600,
    "primary_jets_stock": "60AN",
    "secondary_jets_stock": "65AN",
    "idle_pilot_mm": 1.5,
    "idle_air_bleed": 100,
    "pe_valve_opening_psi": 1.5,
    "electric_choke_temp_f": 180,
    "tuning_notes": {
      "cold_climate_pilot": "1.6mm",
      "altitude_primary_jet": "62AN",
      "idle_mixture_turns_out": "1.25",
      "accelerator_pump_cam": "stock_profile_no_lift"
    }
  },
  "tolerances": {
    "bore_tolerance_inch": 0.001,
    "stroke_tolerance_inch": 0.001,
    "deck_height_spec": "factory_machined",
    "crankshaft_journal_finish": "micron_polished"
  },
  "sources": [
    {
      "type": "factory_service_manual",
      "title": "Ford Mustang 1965 Factory Service Manual",
      "chapter": "Engine Assembly Specifications",
      "verified_by": "Austin Hood, ASE Master Technician"
    },
    {
      "type": "shop_measurement",
      "date": "2026-07-10",
      "location": "Whitehall Garage Bay 3",
      "instrument": "Mitutoyo digital micrometer"
    }
  ],
  "related_pages": [
    "https://austin-hood.4ort.net/mustang-289.html",
    "https://austin-hood.4ort.net/"
  ]
}