1990 GMC Sierra 5.7 Engine Specifications
The 1990 GMC Sierra was equipped with a variety of engine options, with the 5.7-liter V8 engine being one of the most popular choices among consumers. This engine, known for its reliability and performance, was part of the General Motors’ small-block engine family. Below are the detailed specifications for the 5.7-liter engine.
| Specification | Details |
|---|---|
| Engine Type | V8 |
| Displacement | 5.7 liters (350 cubic inches) |
| Bore x Stroke | 4.00 in x 3.48 in |
| Compression Ratio | 9.5:1 |
| Horsepower | 190 hp @ 4,600 rpm |
| Torque | 300 lb-ft @ 3,200 rpm |
| Fuel System | Multi-Port Fuel Injection (MPFI) |
| Ignition System | HEI (High Energy Ignition) |
| Max RPM | 5,000 rpm |
Engine Configuration
The 5.7-liter engine in the 1990 GMC Sierra is characterized by its robust V8 configuration, which is known for delivering a balance of power and efficiency. Below are some key aspects of the engine configuration:
Design Features
- V8 Layout: The engine features a traditional V8 layout, which provides smooth operation and good power delivery.
- Cast Iron Block: The engine block is made from cast iron, contributing to durability and longevity.
- Aluminum Cylinder Heads: The use of aluminum for the cylinder heads helps reduce weight and improve heat dissipation.
- Pushrod Design: The engine uses a pushrod design, which is simpler and often more reliable than overhead cam designs.
Performance Characteristics
- Torque Curve: The engine produces peak torque at a relatively low RPM, making it suitable for towing and hauling.
- Fuel Efficiency: While not as fuel-efficient as modern engines, the 5.7-liter engine offers reasonable fuel economy for its time.
- Aftermarket Support: The popularity of the small-block engine means there is a wide range of aftermarket parts available for performance upgrades.
Engine Oil Specifications & Service Intervals
Maintaining the proper engine oil and adhering to service intervals is crucial for the longevity and performance of the 1990 GMC Sierra’s 5.7-liter engine. Below are the recommended oil specifications and service intervals.
Engine Oil Specifications
| Specification | Details |
|---|---|
| Oil Type | SAE 10W-30 or 10W-40 |
| Oil Capacity (with filter) | 5 quarts (4.73 liters) |
| Oil Filter | AC Delco PF52 or equivalent |
| API Rating | API SG or higher |
Service Intervals
The following service intervals are recommended for the 1990 GMC Sierra 5.7 engine:
- Oil Change Interval: Every 3,000 to 5,000 miles (4,800 to 8,000 km) or every 3 months, whichever comes first.
- Oil Filter Change: Replace with every oil change.
- Coolant Flush: Every 30,000 miles (48,000 km) or every 2 years.
- Transmission Fluid Change: Every 30,000 miles (48,000 km).
- Fuel Filter Replacement: Every 15,000 miles (24,000 km).
Conclusion
The 1990 GMC Sierra with the 5.7-liter engine remains a popular choice for truck enthusiasts due to its solid performance, reliability, and ease of maintenance. Understanding the engine specifications, configuration, and proper maintenance practices can help owners keep their vehicles running smoothly for years to come. Regular oil changes and adherence to service intervals are essential to ensure the engine operates at its best. Whether used for work or leisure, the 5.7-liter engine continues to be a testament to GMC’s engineering excellence.
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