A 1966 Mustang I6 Story: How Marissa Built Her First Classic
Some Mustang stories begin with childhood memories. Others grow out of family traditions passed down through generations. This 1966 Mustang I6 story, however, follows a different path — one shaped by curiosity, patience, and the quiet confidence of someone who didn’t chase horsepower, but the simple joy of driving.
From an early age, Marissa attended car meets with her father. Although no one in her family owned a classic car, she slowly learned to appreciate old machines, honest mechanics, and cars that carried real stories. Among them, the Ford Mustang always stood apart — not as a dream poster, but as a realistic possibility.
Why a Six-Cylinder Mustang Made Sense
In 2015, shortly after earning her diploma, Marissa started looking for her first car. At that time, she wasn’t searching for a classic Mustang. Still, fate intervened.
While driving with a family friend named John, they passed a parked 1965 Mustang coupe. Almost instinctively, Marissa mentioned that she would love to buy a car like that someday and restore it herself. Coincidentally, John owned a 1966 Mustang coupe — and he had just decided to sell it.
A few days later, they traveled to Washington State. Once there, they removed the car cover and prepared for a test drive. Marissa had never driven a classic before. Nevertheless, the car felt honest, predictable, and welcoming.
At that moment, her 1966 Mustang I6 story truly began.
A Mustang With Little History — and Plenty of Promise
The purchase was finalized in August 2015. The Mustang hadn’t been registered since 2007, which meant additional paperwork and unexpected costs. Even so, Marissa never hesitated.
Unfortunately, the car came with very little documented history. John had purchased it years earlier from an elderly woman, but no records survived. What remained, however, was the VIN — and it told an important story.
The coupe left the Dearborn, Michigan factory finished in Silver Blue (code Y). From day one, it featured a 200ci inline-six paired with a C4 automatic transmission. At some point, a previous owner replaced the original engine with another 200ci I6 from 1970. Thankfully, the swap was done properly, and the car retained its factory balance.
For Marissa, originality mattered — but usability mattered more.
Bringing a Sleeping Mustang Back to Life
A thorough inspection revealed predictable issues. Rust appeared on the roof, door corners, and rain channels. The passenger-side floor pan needed replacement, and the interior required attention. Meanwhile, although the engine started easily, the carburetor clearly needed tuning.
Rather than feeling discouraged, Marissa embraced the process.
Over the following four months, the Mustang steadily returned to the road. Sheet metal repairs were completed, the interior refreshed, and the body repainted. Throughout the restoration, the inline-six remained untouched — reliable, smooth, and perfectly suited to daily driving.
Even years later, it continues to prove her decision right.
Turning an Inline-Six Mustang Into a Daily Driver
In November 2016, an accident changed everything. Marissa escaped unharmed, but the Mustang required repairs. Instead of simply fixing the damage, she decided to improve the car.
She converted the factory six-lug setup to five lugs, which allowed the installation of a FoMoCo 8-inch rear axle. Up front, drum brakes gave way to disc brakes, dramatically improving safety. Soon after, she installed 17-inch wheels, running 235 tires in front and 255 at the rear.
At the same time, modern upgrades appeared. A contemporary audio system replaced the original unit. LED headlights and taillights followed. Finally, GT-style rear trim and fuel cap made room for a dual exhaust system.
As a result, this 1966 Mustang I6 became easier — and safer — to drive every day.
Still a Six-Cylinder, for Now
In May 2018, after additional bodywork to accommodate the wider rear tires, Marissa repainted the car. She chose the original Silver Blue, refined to appear deeper and more vibrant than the factory finish.
Today, the inline-six still powers the Mustang. Eventually, Marissa plans to install a 1991 5.0L V8, selected carefully for reliability and reasonable fuel consumption. Since the car remains her daily driver, practicality still guides every decision.
Future upgrades may include Wilwood front brakes, a manual transmission, a shorter rear gear ratio, and lightly tinted windows. For now, however, nothing feels urgent.
Why This 1966 Mustang I6 Story Matters
Marissa knows she has invested more than the car’s market value. Still, that never mattered. This 1966 Mustang I6 story isn’t about numbers, rarity, or prestige.
Instead, it’s about learning. It’s about driving. And most importantly, it’s about building a Mustang that grows alongside its owner.
Because sometimes, the most meaningful Mustang stories don’t begin with a V8 — they begin with a simple decision to say yes.
