Vehicle Description
1971 Plymouth Road Runner GTX-R – Viper V10-Powered Pro-Touring Legend
This 1971 Plymouth Road Runner GTX-R is not a restoration—it’s a ground-up re-engineering and re-imagining of a classic muscle car, built by Horsepower Northwest to pro-touring perfection. At its core lies a monstrous 630-horsepower Gen 3 Viper V10 engine mated to a Tremec Viper T56 Magnum 6-speed manual transmission. Wrapped in stunning PPG F8 Green paint and featuring a fully custom leather interior with Viper bucket seats, this build combines cutting-edge performance from RMS and Baer with flawless craftsmanship. With a stiffened chassis, modern suspension, Baer 6-piston brakes, and countless custom details, this GTX-R represents the absolute pinnacle of the restomod craft.
Engine & Drivetrain
- 8.3L (505ci) Gen 3 Viper V10 SFI engine
- 630 horsepower rating
- Tremec Viper T56 Magnum 6-speed manual transmission
- Dr. Diff aluminum 8 ¾” rear end housing
- 3.70 True Trac limited-slip differential
- Custom side-exit dual exhaust system
Exterior & Body
- PPG F8 Green basecoat/clearcoat finish
- House of Kolor clear coat for exceptional depth
- Flush-mounted glass for sleek appearance
- Demon headlight-style cold air intake system
- Custom radiator and core support
- Boze custom 18-inch (front) and 19-inch (rear) wheels
Interior & Comfort
- Full custom leather interior
- Dodge Viper bucket seats
- One-piece leather headliner
- Billet aluminum pistol-grip shifter
- Custom Classic Instruments gauge cluster
- Tilt steering column
Chassis & Suspension
- Fully stiffened and braced chassis
- RMS AlterKation front suspension system
- RMS StreetLynx rear 4-link suspension system
- Power rack-and-pinion steering
- Professional pro-touring geometry and tuning
Brakes & Cooling
- Baer 6-piston front calipers
- Baer 14-inch cross-drilled disc brakes (front & rear)
- Aluminum radiator with dual electric fans
- Custom cooling system engineered for the V10
- High-performance brake lines and fluid
Features & Amenities
- Restomod Air climate control system
- Power windows
- Keyless entry with push-button start
- Modern sound system (integrated)
- Full custom wiring harness
- Built by Horsepower Northwest (renowned builder)
The 1971 Plymouth Road Runner GTX-R is a masterpiece of modern performance engineering fused with timeless American muscle design. This isn’t just a car with an engine swap; it’s a holistic, no-compromise build where every component—from the RMS suspension and Baer brakes to the custom chassis bracing and flush-mounted glass—has been selected and integrated to create a world-class driver’s car. The 630-horsepower Viper V10 provides a torrent of power matched perfectly by the T56 Magnum transmission, while the pro-touring suspension ensures it can handle curves as well as it dominates straights. The stunning PPG F8 Green paint and exquisite custom leather interior demonstrate a level of finish that matches the mechanical brilliance. This GTX-R is the definitive statement in pro-touring excellence: devastatingly fast, supremely capable, impeccably detailed, and built by one of the most respected shops in the industry.
630HP Viper V10 | T56 Magnum | RMS Suspension | Baer 6-Piston | Custom Leather | Pro-Touring