GMC 350 Engine Specifications
The GMC 350 engine, often referred to as the 5.7L V8, is a popular choice among truck and SUV enthusiasts. Known for its robust performance and reliability, this engine has been used in a variety of GMC models over the years. Below are the detailed specifications of the GMC 350 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 | 9.0:1 |
| Horsepower | 190-250 hp (varies by model year and configuration) |
| Torque | 300-350 lb-ft (varies by model year and configuration) |
| Fuel System | Multi-Point Fuel Injection (MPFI) |
| Ignition System | Distributor-based ignition |
| Cooling System | Water-cooled |
Engine Configuration
The GMC 350 engine features a classic V8 configuration, which is known for its balance of power and efficiency. Below are some key aspects of its configuration:
Key Features
- V8 Layout: The V8 layout provides a smooth operation and a good power-to-weight ratio.
- Cast Iron Block: The engine block is made of cast iron, which contributes to durability and longevity.
- Aluminum Cylinder Heads: Many versions of the GMC 350 feature aluminum cylinder heads, which help reduce weight and improve heat dissipation.
- Pushrod Design: The engine utilizes a pushrod design, which is simpler and often more reliable than overhead cam designs.
Performance Variants
The GMC 350 engine has been offered in several performance variants over the years, including:
- Base Model: Typically produces around 190 hp and 300 lb-ft of torque.
- High-Performance Version: Some models can produce up to 250 hp and 350 lb-ft of torque, particularly in performance-oriented trucks and SUVs.
Engine Oil Specifications
Proper lubrication is crucial for the longevity and performance of the GMC 350 engine. Here are the recommended engine oil specifications:
| Specification | Details |
|---|---|
| Oil Type | SAE 5W-30 or SAE 10W-30 |
| Oil Capacity | 5 quarts (with filter) |
| Oil Filter | AC Delco PF25 or equivalent |
Oil Change Intervals
To maintain optimal engine performance, regular oil changes are essential. The recommended oil change intervals for the GMC 350 engine are as follows:
- Conventional Oil: Every 3,000 to 5,000 miles.
- Synthetic Oil: Every 7,500 to 10,000 miles.
- Severe Driving Conditions: If driving in extreme temperatures, towing, or frequent short trips, consider changing oil every 3,000 miles regardless of oil type.
Service Intervals
Regular maintenance is vital for the GMC 350 engine to ensure it runs smoothly and efficiently. Below are the recommended service intervals:
| Service Item | Interval |
|---|---|
| Oil Change | 3,000 to 10,000 miles (depending on oil type) |
| Air Filter Replacement | 15,000 to 30,000 miles |
| Fuel Filter Replacement | 30,000 miles |
| Spark Plug Replacement | 30,000 to 100,000 miles (depending on plug type) |
| Coolant Flush | 30,000 miles or every 2 years |
| Transmission Fluid Change | 30,000 to 60,000 miles |
Additional Maintenance Tips
To keep your GMC 350 engine in top shape, consider the following maintenance tips:
- Regularly check and top off fluids, including coolant, brake fluid, and power steering fluid.
- Inspect belts and hoses for wear and replace as necessary.
- Keep the engine clean to prevent dirt and debris from affecting performance.
- Pay attention to any unusual noises or performance issues and address them promptly.
Conclusion
The GMC 350 engine is a reliable and powerful choice for those seeking performance in a truck or SUV. Understanding its specifications, oil requirements, and service intervals can help ensure that it remains in excellent condition for years to come. Regular maintenance and attention to detail will go a long way in maximizing the lifespan and performance of this iconic engine.
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