The Chevrolet Malibu IV Sport Coupe, produced for the 1978 and 1979 model years, represented a downsized iteration of Chevrolet’s popular mid-size offering. Positioned as a sporty variant within the fourth-generation Malibu lineup (1978-1983), the 3.8 V6 with a three-speed automatic transmission offered a balance between performance and convenience. This configuration aimed to appeal to buyers seeking a comfortable, stylish coupe with adequate power for highway cruising. It sat in the middle of the Malibu range, offering more power than the base inline-six engines but less than the higher-output V8 options available in other Malibu trims.
Technical Specifications
| Brand | Chevrolet |
| Model | Malibu |
| Generation | Malibu IV Sport Coupe |
| Type (Engine) | 3.8 V6 (115 Hp) CAT Automatic |
| Start of production | 1978 |
| End of production | 1979 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 6 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 12.3 kg/Hp, 81.6 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 183.1 Nm/tonne |
| Power | 115 Hp @ 3800 rpm |
| Power per litre | 30.3 Hp/l |
| Torque | 258 Nm @ 2000 rpm, 190.29 lb.-ft. @ 2000 rpm |
| Engine layout | Front, Longitudinal |
| Engine displacement | 3791 cm3, 231.34 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 96.5 mm, 3.8 in. |
| Piston Stroke | 86.4 mm, 3.4 in. |
| Compression ratio | 8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 4 l, 4.23 US qt | 3.52 UK qt |
| Kerb Weight | 1409 kg, 3106.31 lbs |
| Trunk (boot) space – maximum | 470 l, 16.6 cu. ft |
| Fuel tank capacity | 68 l, 17.96 US gal | 14.96 UK gal |
| Length | 4895 mm, 192.72 in |
| Width | 1816 mm, 71.5 in |
| Height | 1354 mm, 53.31 in |
| Wheelbase | 2745 mm, 108.07 in |
| Front track | 1486 mm, 58.5 in |
| Rear (Back) track | 1467 mm, 57.76 in |
| Front overhang | 915 mm, 36.02 in |
| Rear overhang | 1235 mm, 48.62 in |
| Ride height (ground clearance) | 137 mm, 5.39 in |
| Drag coefficient (Cd) | 0.45 |
| Minimum turning circle (turning diameter) | 12.2 m, 40.03 ft |
| Approach angle | 20° |
| Departure angle | 15° |
| Ramp-over (brakeover) angle | 14° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 3 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | dependent spring suspension, Transverse stabilizer, Trailing arm |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Steering type | Steering rack and pinion |
| Tires size | 185/75 R14 |
| Wheel rims size | 6.0J x 14 |
Powertrain & Engine Architecture
The heart of this Malibu variant was Chevrolet’s 3.8-liter (231 cubic inch) V6 engine. This engine, internally designated as the 3800, was a staple of GM’s lineup for many years. The 1978-79 version utilized a two-barrel carburetor for fuel delivery, a relatively simple system compared to the fuel injection systems becoming more common at the time. The engine featured an overhead valve (OHV) valvetrain, with two valves per cylinder. The 8:1 compression ratio was a compromise designed to work with the available fuel grades and meet emerging emissions regulations. The three-speed automatic transmission, a TH350, was a common and reliable unit, known for its smooth operation. It was geared for comfortable cruising rather than outright acceleration.
Driving Characteristics
The 115 horsepower and 190 lb-ft of torque provided by the 3.8L V6 and automatic transmission resulted in adequate, but not exhilarating, performance. Acceleration from 0-60 mph was estimated to be around 11-12 seconds. The automatic transmission’s gear ratios were optimized for fuel economy and smooth shifts, rather than aggressive downshifts. Compared to the available manual transmission or the larger V8 engines, this combination felt noticeably less responsive. However, it offered a more relaxed driving experience, particularly in city traffic. The rear-wheel-drive layout provided a balanced feel, but the relatively soft suspension tuning prioritized ride comfort over sharp handling.
Equipment & Trim Levels
The Sport Coupe trim generally included features like color-keyed carpeting, a deluxe steering wheel, and upgraded interior trim compared to the base Malibu models. Standard features for the 1978-79 Malibu included a full-length rocker panel molding, bright wheel well moldings, and a cloth and vinyl interior. Optional extras included air conditioning, power steering, power brakes, a stereo system, and cruise control. The Sport Coupe often featured a more aggressive exterior appearance with a distinctive grille and trim.
Chassis & Braking
The Malibu IV Sport Coupe utilized a body-on-frame construction, a common practice for American cars of the era. The front suspension was independent, employing McPherson struts with coil springs and an anti-roll bar. The rear suspension was a traditional solid axle setup with coil springs and a transverse stabilizer bar. Braking duties were handled by ventilated discs at the front and drum brakes at the rear. The steering system was a rack-and-pinion setup, providing reasonably precise steering feel. The 185/75 R14 tires offered a good balance of ride comfort and grip for the time.
Market Reception & Comparison
The 3.8L V6 automatic Malibu Sport Coupe was generally well-received as a comfortable and practical coupe. Critics noted its smooth ride and adequate power for everyday driving. However, it wasn’t considered a performance leader compared to some of its competitors, such as the Ford Mustang or Pontiac Firebird. Fuel economy was typical for the era, averaging around 18-22 mpg in combined driving. Compared to the inline-six Malibu models, the V6 offered a noticeable power increase. Compared to the V8 options, it provided better fuel economy but less outright performance. Reliability was generally good, although carburetor maintenance could be required over time.
Legacy
The 1978-79 Chevrolet Malibu IV Sport Coupe with the 3.8L V6 and automatic transmission represents a transitional period in automotive history. It showcased the downsizing trend of the late 1970s while still retaining traditional American styling and engineering. The 3800 V6 engine proved to be a durable and long-lasting powerplant, and many examples are still on the road today. In the used car market, these Malibus are appreciated by collectors and enthusiasts for their classic styling and relative simplicity. While not a high-performance machine, the 3.8L automatic variant offers a comfortable and enjoyable driving experience, and remains a representative example of late 1970s American automotive design.
