GMC 7.4 Liter Engine Specifications
The GMC 7.4-liter engine, also known as the 454 cubic inch engine, has been a staple in various GMC and Chevrolet vehicles, particularly in trucks and SUVs. This powerhouse is known for its robust performance and reliability, making it a popular choice among enthusiasts and professionals alike. Below are the detailed specifications of the GMC 7.4-liter engine.
| Specification | Details |
|---|---|
| Engine Type | V8 |
| Displacement | 7.4 liters (454 cubic inches) |
| Bore x Stroke | 4.00 in x 4.00 in |
| Compression Ratio | 8.75:1 |
| Horsepower | 230-290 hp (varies by model and year) |
| Torque | 385-410 lb-ft (varies by model and year) |
| Fuel System | Carbureted / Fuel Injected (varies by model and year) |
| Ignition Type | Distributor Ignition |
| Cooling System | Water-cooled |
| Weight | Approximately 600 lbs |
Engine Configuration
The GMC 7.4-liter engine features a classic V8 configuration, which is known for its balance of power and smooth operation. This engine is designed with a cast iron block and aluminum cylinder heads, contributing to its durability and performance. The engine’s design allows for efficient airflow, which is crucial for maximizing power output and fuel efficiency.
Key Features of the Engine Configuration
- V8 layout for optimal power delivery.
- Cast iron block for strength and longevity.
- Aluminum cylinder heads for reduced weight and improved heat dissipation.
- Single overhead camshaft (SOHC) design for simplicity and reliability.
- Hydraulic lifters for reduced maintenance and improved performance.
Engine Oil Specifications
Proper lubrication is vital for the longevity and performance of the GMC 7.4-liter engine. The engine oil specifications are crucial for ensuring that the engine operates smoothly and efficiently.
Recommended Engine Oil
- Viscosity: 10W-30 or 10W-40 (depending on climate and operating conditions).
- API Rating: SM or higher for modern formulations.
- Oil Type: Conventional or synthetic oil can be used based on preference and driving conditions.
Oil Capacity
- With filter: Approximately 6 quarts.
- Without filter: Approximately 5.5 quarts.
Service Intervals
Regular maintenance is essential to keep the GMC 7.4-liter engine performing at its best. Adhering to service intervals can help prevent issues and extend the life of the engine.
Oil Change Intervals
- Every 3,000 to 5,000 miles for conventional oil.
- Every 5,000 to 7,500 miles for synthetic oil.
Other Maintenance Recommendations
- Check and replace the air filter every 15,000 to 30,000 miles.
- Inspect spark plugs and ignition components every 30,000 miles.
- Flush the cooling system every 30,000 miles or as needed.
- Inspect the fuel system and replace fuel filters as necessary.
Conclusion
The GMC 7.4-liter engine is a powerful and reliable choice for those seeking performance in their vehicles. Understanding its specifications, engine configuration, oil requirements, and service intervals is essential for maintaining its efficiency and longevity. Regular maintenance and proper care will ensure that this engine continues to deliver the power and performance that drivers expect from GMC vehicles.
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