Sourced production or model lifecycle range used by the main catalog timeline.
PontiacGTO
A cynical loophole and a big engine in a small car — and, with it, the muscle car was born.
The 1964 Pontiac GTO is widely credited with starting the muscle car era, and it did so almost by accident. General Motors had a rule limiting engine size in its mid-size cars, but John DeLorean's Pontiac engineers noticed the rule only covered standard engines, not options. So they offered the big 389-cubic-inch V8 from Pontiac's full-size cars as an option on the mid-size Tempest, and called it the GTO.
The formula — a large, powerful engine in a light, affordable body — was so obviously appealing that it caught GM off guard. The company expected to sell about 5,000; it sold 32,450 in the first year, and every rival rushed to copy it. Rated at 325 hp, the GTO made straight-line speed cheap and attainable.
Almost every American performance car of the next decade descended from that loophole. The GTO didn't just sell — it defined a category.
The Pontiac GTO is a front-engine, rear-drive, two-door, and four-passenger automobile manufactured and marketed by the Pontiac division of General Motors over four generations from 1963 until 1974 in the United States—with a fifth generation made by GM's Australian subsidiary, Holden, for the 2004 through 2006 model years.
Text adapted from “Pontiac GTO” on Wikipedia ↗ · CC BY-SA 4.0 ↗ · retrieved 2026-07
Dates with their meaning intact
Model years represented in FuelEconomy.gov; a US-market observation, not a worldwide production range.
First-admission years observed in Dutch vehicle registrations; this is market evidence, not a worldwide production range.