1973 Pontiac Firebird Formula 400 Hardtop Coupe — 400 cu in V8, 4-barrel, 4-speed wide-ratio manual

Service topics

7

Scheduled topics

7

Applicability stated

7

Exact references

1

Before ordering Identify your engine, options and build date. Part numbers and sizes can change within one model year. Shopping links appear only for catalog-backed references; still verify the listing against your vehicle before ordering.

• Engine oil filterView intervals, applicability and sources

  01

  Engine oil filter

  Exact reference available

  Manufacturer-catalog fitment scoped to the exact engine row in the Firebird application table.

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 12,000 mi / 8 months · Replace at the first oil change, then at every other oil change.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 4 months or 6,000 miles — oil-filter row · checked 2026-08-30

  Baldwin B39 cataloged fitment

  This manufacturer application record establishes filter fitment only; it does not alter the separately sourced service schedule.

  Applies to: 1973 · 400 cu in V8, 2-barrel, 400 cu in V8, 4-barrel, 400 cu in Ram Air V8, 4-barrel · United States · Baldwin's exact 1973 Firebird V8-400 (6.6L) carbureted row assigns B39; confirm the engine code and installed filter before ordering.

  Source: Parker/Baldwin Filters — 2025 Automotive Applications catalog · PDF page 942, Pontiac 1973 Firebird V8-400 (6.6L) carbureted row — Lube — B39 · checked 2026-08-31

  Verified ordering references

  • Validated equivalentBaldwin B39

    Qty. 1 · Engine lubricating-oil filter · catalog-listed

    Cataloged for the 1973 Firebird V8-400 (6.6L) carbureted; verify engine code and installed dimensions.

    Catalog: Parker/Baldwin Filters — 2025 Automotive Applications catalog · PDF page 942, Pontiac 1973 Firebird V8-400 (6.6L) carbureted row — Lube — B39 · checked 2026-08-31

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• Chassis and control-linkage lubricationView intervals, applicability and sources

  02

  Chassis and control-linkage lubrication

  Sourced interval available

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 6,000 mi / 4 months · Lubricate the clutch linkage, parking-brake linkage, throttle and shift linkage, and other charted fittings.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 4 months or 6,000 miles — lubrication rows and 11-fittings diagram · checked 2026-08-30

• Brake-system inspectionView intervals, applicability and sources

  03

  Brake-system inspection

  Sourced interval available

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 12,000 mi / 12 months · Inspect the brake system; inspect disc-brake pads and check master-cylinder fluid at the shorter chart intervals.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 6,000 miles; every 12 months or 12,000 miles · checked 2026-08-30

• Paper air-cleaner elementView intervals, applicability and sources

  04

  Paper air-cleaner element

  Sourced interval available

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 12,000 mi / 12 months · Replace the six-cylinder element; inspect and test the air cleaner at 6,000 miles and service severe dust exposure more often.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 12,000 miles; first 4 months/6,000 miles and then 12 months/12,000 miles · checked 2026-08-30

• Spark plugsView intervals, applicability and sources

  05

  Spark plugs

  Sourced interval available

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 12,000 mi · Replace the spark plugs and inspect the plug leads at each 6,000-mile service.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 12,000 miles; every 6,000 miles plug-lead row · checked 2026-08-30

• Front wheel bearingsView intervals, applicability and sources

  06

  Front wheel bearings

  Sourced interval available

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 24,000 mi / 24 months · Clean and repack the front wheel bearings.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 24,000 miles — front-wheel-bearing row · checked 2026-08-30

• Tire rotationView intervals, applicability and sources

  07

  Tire rotation

  Sourced interval available

  Applies to: 1973 · United States, Canada · The period Esso chart is explicitly titled 1973–74 Firebird. It is an independent service-data guide rather than a Pontiac factory publication; use the shorter printed severe-service boundary when applicable.

  Published interval: 6,000 mi · Rotate the tires and inspect them for damage.

  Source: Esso — 1975 Car Care Guide, 1973–1974 Pontiac Firebird service chart (preserved by The Old Car Manual Project) · Guide scan 1-092 — Every 6,000 miles — tire row · checked 2026-08-30