1978 Cadillac 425 Engine Specs
The 1978 Cadillac 425 engine was a powerful and reliable V8 engine that was widely used in Cadillac vehicles during that era. This engine was known for its smooth performance and impressive torque, making it a popular choice among car enthusiasts. In this article, we will explore the engine configuration, engine oil specs, and service intervals for the 1978 Cadillac 425 engine.
Engine Configuration
The 1978 Cadillac 425 engine was a V8 engine with a displacement of 7.0 liters (425 cubic inches). It featured an overhead valve (OHV) design, with two valves per cylinder. The engine had a bore of 4.082 inches and a stroke of 4.060 inches. It was equipped with a Rochester Quadrajet four-barrel carburetor, which provided excellent fuel delivery and performance.
With a compression ratio of 8.5:1, the 1978 Cadillac 425 engine produced a horsepower of 180 at 4000 RPM and a torque of 320 lb-ft at 2000 RPM. These specifications made the engine suitable for both smooth cruising and powerful acceleration.
Engine Oil Specs
Choosing the right engine oil is crucial for maintaining the performance and longevity of the 1978 Cadillac 425 engine. Here are the recommended engine oil specifications:
| Specification | Value |
|---|---|
| Engine Oil Type | SAE 10W-30 |
| Oil Capacity (with filter) | 5 quarts |
| Oil Capacity (without filter) | 4.5 quarts |
| Oil Filter | AC Delco PF24 or equivalent |
It is important to use high-quality engine oil that meets the specified viscosity requirements. Regular oil changes, along with using the recommended oil filter, will help keep the engine running smoothly and protect it from excessive wear and tear.
Service Intervals
Proper maintenance is essential for ensuring the longevity and optimal performance of the 1978 Cadillac 425 engine. Here are the recommended service intervals for various engine components:
- Oil Change: Every 3,000 miles or every 3 months, whichever comes first.
- Oil Filter Replacement: Every oil change.
- Spark Plug Replacement: Every 30,000 miles or every 24 months, whichever comes first.
- Air Filter Replacement: Every 12,000 miles or every 12 months, whichever comes first.
- Fuel Filter Replacement: Every 30,000 miles or every 24 months, whichever comes first.
- Timing Belt Replacement: Not applicable (the 1978 Cadillac 425 engine uses a timing chain).
Following these service intervals will help ensure that the engine remains in optimal condition and performs at its best. Regular maintenance and timely replacements of engine components are key to preventing potential issues and maximizing the lifespan of the 1978 Cadillac 425 engine.
Conclusion
The 1978 Cadillac 425 engine was a powerful V8 engine that offered impressive performance and reliability. With its well-designed engine configuration, recommended engine oil specifications, and proper service intervals, this engine could deliver a smooth and enjoyable driving experience. By following the maintenance guidelines and using the recommended engine oil, Cadillac owners could keep their 1978 vehicles running smoothly for years to come.
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