1971 Pontiac GTO 455 HO

Muscle car powered by Pontiac 455 HO V8.

Licensed 1971 Pontiac GTO front-left view used as exact-year body context; exterior photos alone are not 455 HO proof.

Factory pathway 1971 Pontiac factory GTO ordered with the 455 HO engine path

Engine Round-port Pontiac 455 HO, distinct from the 1970 D-port 455 HO and later SD-455

Factory rating 335 gross hp / 310 net hp context and 480 lb-ft in checked 1971 references

Production context 10,532 total 1971 GTOs reported; exact non-Judge 455 HO splits still need stronger registry data

Authenticity warning Judge trim, hood scoops, and same-year GTO photos are not standalone 455 HO proof

Story

1971 Pontiac GTO 455 HO

The 1971 Pontiac GTO 455 HO is the quieter companion to the final-year Judge. The same round-port 455 HO made the Judge important, but it also mattered on standard GTO builds where the value is in the engine path, paperwork, and drivetrain evidence rather than decals.

Reviewed sources describe the 1971 455 HO as Pontiac's low-compression round-port high-output 455, rated around 335 gross horsepower with 310 net horsepower context and 480 lb-ft of torque in the checked model references. It was distinct from the 1970 D-port 455 HO and from the later SD-455, which makes engine-code, casting, intake, exhaust, and documentation review especially important.

The page treats same-year 1971 GTO photos as model-year context unless a source independently proves the 455 HO option. Judge stripes, spoiler, or paint are separate package evidence; they can help explain the year, but they do not prove a non-Judge 455 HO car. The practical check is still PHS/order documentation aligned with engine, transmission, axle, paint, trim, and owner-history records.

**Licensed 1971 Pontiac GTO rear-left view used as exact-year rear trim context only.**Jeremy via Wikimedia Commons · CC BY 2.0

Specs

Car type: Muscle car
Body: Two-door hardtop and convertible context
Engine: 455 cu in Pontiac 455 HO V8; 8.4:1 low-compression, round-port 1971 HO context
Horsepower: 335 gross hp @ 4,800 rpm and 310 net hp context in checked references
Torque: 480 lb-ft context in checked 1971 references
Carburetion: Rochester Quadrajet four-barrel context

Equipment

1971 round-port Pontiac 455 HO engine
Ram Air-style exhaust manifold and aluminum intake context
Functional Ram Air availability where ordered and documented
Muncie 4-speed or Turbo Hydra-Matic automatic context depending on car
12-bolt rear-axle context for 455 GTOs
Judge graphics and spoiler are separate package evidence, not required 455 HO proof

1971 GTO hood-scoop detail crop; Ram Air and 455 HO claims require documentation.Jeremy via Wikimedia Commons; crop by Classic Muscle Cars · CC BY 2.0

Linked Parts

Price history

Values

Nominal dollars from original price sheets, auction archives, and approved value references.

Original Price

A verified original price is not yet available for this car.

Market Observations

Price guide value $39,200

Jul 1, 2026 · Hagerty Price Guide · Current guide point
Base/non-Judge 1971 GTO two-door coupe with the 455/335-hp four-barrel HO in #3 Good condition. · unknown · good Hagerty's July 2026 configuration selector and selected-configuration condition panel supply the current #3 Good value. Judge and non-HO configurations are excluded.
1971 Pontiac GTO non-Judge 455 HO coupe values
High bid $90,000

Jan 18, 2026 · Mecum Kissimmee
Non-Judge 455 HO automatic convertible 242671P113750 recorded as original/highly original. · survivor · excellent Hagerty and Classic.com record the exact chassis, no-sale high bid, date, amount, body, automatic transmission, mileage status, and venue. The same chassis's 2022 sale is excluded in favor of this latest observation.
1971 Pontiac GTO VIN 242671P113750 1971 Pontiac GTO VIN 242671P113750
Auction sale $80,000

Feb 22, 2025 · GAA Greensboro
Non-Judge 455 HO four-speed hardtop 242371Z109981, restored and refinished in black from its original Castilian Bronze. · restored · good Classic.com records the exact-chassis completed result, date, amount, manual transmission, mileage status, and venue. The prior BaT archive corroborates factory 455 HO identity, documentation, restoration, and color change. Earlier transactions and a no-sale are excluded.
1971 Pontiac GTO hardtop 455 HO four-speed VIN 242371Z109981
Auction sale $195,250

Nov 11, 2023 · Mecum Las Vegas
Non-Judge 455 HO four-speed hardtop 242371P108527 with matching drivetrain, Safe-T-Track rear differential, and PHS documentation. · restored · excellent Hagerty records the exact-chassis completed result, date, amount, body, mileage, colors, and venue. Mecum and BaT corroborate the 455 HO configuration, body-off refurbishment, matching drivetrain, and documentation. The 2022 and earlier 2023 results are excluded as repeat observations.
1971 Pontiac GTO VIN 242371P108527 1971 Pontiac GTO 455 HO four-speed, lot S118 1971 Pontiac GTO hardtop 455 HO four-speed, lot 74,003
Auction sale $110,000

Jan 11, 2019 · Mecum Kissimmee
Non-Judge 455 HO four-speed convertible 242671P108757 with PHS documentation and a factory-correct frame-off restoration. · restored · concours Hagerty records the exact-chassis completed result, date, amount, body, 335-hp configuration, and venue. Mecum and the earlier Barrett-Jackson archive corroborate the 455 HO identity, documentation, restoration, and award history. The 2016 sale is not counted separately.
1971 Pontiac GTO VIN 242671P108757 1971 Pontiac GTO 455 HO convertible, lot F120 1971 Pontiac GTO 455 HO convertible, lot 1348
High bid $65,000

Dec 8, 2012 · Mecum Kansas City
Non-Judge 455 HO hardtop 242371Z106545 with original engine, M22 transmission, rear axle, and supporting factory paperwork. · survivor · excellent Mecum records the exact chassis, no-sale high bid, date, original 455 HO drivetrain, one repaint, original interior, and build sheet, invoice, and Protect-O-Plate.
1971 Pontiac GTO 455 HO, lot S116

Values move with paperwork, originality, options, condition, venue, and body style. High bids and guide values are labeled separately from completed sales.

Reference records

Options, Colors & Components

Source-backed details for trim, chassis, production, and authenticity.

Transmission

Factory transmission Muncie 4-speed manual context
Factory transmission Turbo Hydra-Matic 400 automatic context

Options

Evidence graphic summarizing 1971 GTO 455 HO identity boundaries and the non-Judge pathway.Classic Muscle · Reference illustration

455 HO 1971 455 HO engine path factory · performance · 1971 round-port 455 HO path, distinct from the 1970 D-port 455 HO and later SD-455.
Ram Air Functional Ram Air induction context optional · performance · Ram Air induction was available with documented 455 HO applications, but hood appearance alone is not proof.
Muncie 4-speed Four-speed manual transmission optional · performance · Manual-transmission claims need car-level paperwork and drivetrain code evidence.
Turbo Hydra-Matic Turbo Hydra-Matic 400 automatic transmission optional · performance · Automatic-transmission claims need paperwork and drivetrain code evidence.
Safe-T-Track Safe-T-Track positive traction rear axle context optional · chassis · Limited-slip and ratio details remain car-specific.
The Judge Separate final-year Judge package optional · appearance · The Judge package is tracked as separate 1971 GTO context. Judge stripes, spoiler, and decals are not required for non-Judge 455 HO identity.

Paint

**1971 GTO front-end detail crop used for model-year nose and trim context.**MercurySable99 via Wikimedia Commons; crop by Classic Muscle Cars · CC BY-SA 4.0

26 Lucerne Blue factory · metallic
43 Limekist Green factory · solid
48 Laurentian Green factory · metallic
75 Cardinal Red factory · solid
chart Other 1971 Pontiac chart colors factory · unknown

Production

Evidence graphic summarizing the 1971 round-port Pontiac 455 HO engine boundary.Classic Muscle · Reference illustration

1971 Pontiac GTO total production total · 10,532 · reported
1971 Pontiac GTO hardtop total by body · 9,497 · reported
1971 Pontiac GTO convertible total by body · 661 · reported
1971 Pontiac GTO Judge hardtop context by option · 357 · reported
1971 Pontiac GTO Judge convertible context by option · 17 · reported

Authenticity

Evidence graphic summarizing 1971 GTO 455 HO transmission and rear-axle verification boundaries.Classic Muscle · Reference illustration

455 HO order evidence PHS/order paperwork should show the 455 HO path for a real 1971 GTO 455 HO claim. · PHS invoice, build sheet, original invoice, VIN/body records, and owner-history records · fraud detection
1971 455 HO engine identity Engine code, casting/date evidence, round-port HO hardware, carburetor, intake, exhaust, and Ram Air equipment should align with the build record. · PHS invoice, engine-code pad, block/head/intake/carburetor casting and date evidence, Ram Air parts, and service records · numbers matching
Judge versus non-Judge identity Judge graphics, decals, and spoiler are separate package evidence and not required for a 1971 GTO 455 HO. · Build documentation, body/trim tags, stripe/spoiler evidence, paint evidence, and owner-history records · trim correctness
Driveline match Transmission and axle should match PHS/build records, engine path, and physical stamp/code evidence. · Transmission tags/stamps, axle tube stamp, PHS paperwork, build sheet, and date-code evidence · date correctness
Paint and trim evidence Paint code, interior trim, wheels, tach/gauges, and shifter should be documented per car. · Trim tag, PHS/build records, original paint traces, interior trim tags, period photos, and restoration records · trim correctness

Still Researching

production Checked sources provide total GTO and Judge hardtop/convertible counts, but not a normalized non-Judge 455 HO production matrix by body, transmission, axle, paint, or trim.

Codes & names