1966 Pontiac GTO
A-body · 1966 was the peak production year for the GTO. New stacked h... · Peak GTO beauty — stacked headlights and perfect proportions
Highly Collectible
Production & Overview
Total Production
96,946
Original MSRP
$2,783
Assembly Plants
Pontiac, MI · Framingham, MA · Kansas City, MO · Baltimore, MD
Wheelbase
115 inches
Body Styles
Sport Coupe · Hardtop · Convertible
Curb Weight
3,445 lbs
Notable Packages & Production
Tri-Power 389 — TriPower
Last year Tri-Power available — GM banned multi-carb after 1966. Most desirable 1966 GTO.
1.8-2.5x base
19,045
produced
Convertible — Conv
Open body — less common than hardtop
1.4-1.8x hardtop
12,798
produced
Available Engines
L 389ci — V8
Final year 389 — standard 4-barrel
335 hp
N 389ci — V8
Tri-Power 389 — final year for Tri-Power in GTO. GM banned multi-carb setups after 1966.
360 hp
Buyer Checklist
⚠ Clone warning: Tri-Power matching numbers last year — significant premium. Non-matching reduces value 35-50%.. Always verify with cowl tag, engine stamp, and registry before purchase.
Order PHS documentation — confirms Tri-Power and other options
Tri-Power — verify three Rochester 2-barrels, correct intake manifold, and linkage
This is the LAST year for Tri-Power — document carefully
Engine stamp verification on block
Floor pan and frame rail rust
Lower quarter panel rust at bottom edge
Firewall tag for paint and trim confirmation
Convertible frame integrity check
Verify stacked headlights operate correctly
Clone GTO check — LeMans donor cars common
Known Problem Areas
Clone GTO from LeMans donor
Floor pan and frame rust
Non-matching engines
Tri-Power fakes — regular 4-barrel cars given Tri-Power appearance
What Drives Value
↑ Increases Value
Tri-Power matching numbers — last year
Convertible Tri-Power
4-speed Muncie
PHS documentation
↓ Decreases Value
Clone GTO
Rust damage
Non-matching engine
Missing PHS documentation on Tri-Power
Restoration Overview
Difficulty
Medium
Parts Availability
Very Good — highest production year means most parts available
Driver Quality Cost
$22,000 – $48,000
Show Quality Cost
$65,000 – $140,000
Key Suppliers
Year One · Ames Performance · PY Classic Pontiac · Ground Up SS
Pop Culture & Legacy
1966 GTO considered by many collectors as the most beautiful GTO design
Stacked headlights became signature Pontiac styling element
Final year of Tri-Power — GM corporate banned multi-carb setups after 1966
Peak production year — 96,946 built
Other Pontiac GTO Years