The 1987 Buick Grand National represents the absolute zenith of American muscle car engineering, a machine where brute force met precision engineering. Under the hood resides the legendary 3.8-liter turbocharged V6, a powerplant that transformed a humble mid-size coupe into a quarter-mile terror. This specific year marked the final iteration of the first-generation Grand National, making the mechanical blueprint inside the hood a particularly significant chapter in GM performance history.
The Heart of the Beast: The 3.8L Turbo V6
The core of the 1987 Grand National is the 3,800cc V6, specifically the L27 variant equipped with a Garrett T5 turbocharger. This engine was a departure for Buick, moving away from its traditional large-displacement V8s to adopt a more efficient, high-revving configuration. The turbocharger, mounted between the cylinder banks, forced air into the combustion chambers, effectively doubling the power output compared to the naturally aspirated Buick 3.8L found in other models. The result was a robust and torquey powerplant that delivered a driving experience unlike anything else on the road.
Performance Specifications and Output
While official figures were conservative for the era, the reality under the hood was significantly more potent. The 1987 Grand National was rated at 245 horsepower and a staggering 350 lb-ft of torque. These numbers, though conservative, translate to explosive acceleration that was completely unprecedented for a car in this class. The combination of the turbocharged V6 and the relatively light chassis allowed the Grand National to sprint from 0 to 60 mph in just over 6 seconds, a performance metric that rivaled much more expensive sports cars of the time.
Forged Internals and Engineering Excellence
To handle the increased stress and power, Buick employed a number of high-strength, forged components that were ahead of their time. The connecting rods, crankshaft, and pistons were all built to withstand the immense pressures generated by the turbocharger. This robust internal architecture was the primary reason for the engine's legendary reliability. Unlike many contemporaries that suffered from premature wear, the 1987 Grand National's powertrain was built to last, forming the foundation for a strong aftermarket scene that persists to this day.
The Transmission and Drivetrain
Power is only useful if it can be delivered efficiently, and the Grand National's driveline was a masterclass in application. The standard transmission was a heavy-duty four-speed manual, paired with a BorgWarner 5-speed overdrive for highway cruising. This setup allowed the driver to harness every bit of the 350 lb-ft of torque while maintaining excellent fuel economy on long stretches of road. For those who preferred convenience, a three-speed automatic transmission was available, though enthusiasts almost unanimously preferred the manual for its engagement and control.
Handling and Chassis Dynamics
An often-overlooked aspect of the 1987 Grand National is its chassis tuning. To manage the immense power, Buick fitted the car with a reinforced suspension, larger sway bars, and specific shock absorbers. This setup kept the car planted and stable during hard acceleration, preventing the dreaded wheelspin common in lesser machines. The standard fitment of 16-inch aluminum "Aero" wheels and high-performance Goodyear Eagle GT tires provided the necessary grip to translate the engine's power into forward momentum, making the Grand National as confident through the corners as it was in a straight line.
