The dream of swapping a powerful Cummins diesel engine into a classic Chevy truck from 1973 to 1987 is alluring to many. The combination of robust, reliable diesel power with the timeless style of a vintage Chevy pickup is undeniably appealing. But embarking on such a project requires thorough planning and a deep understanding of the complexities involved. This guide will delve into the essential aspects of a 73-87 Chevy Cummins conversion kit, addressing common questions and providing valuable insights for those considering this ambitious undertaking.
What is a Cummins Conversion Kit?
A Cummins conversion kit is not a single, all-inclusive package. Instead, it's more accurate to think of it as a collection of necessary components and instructions tailored to adapt a Cummins engine to fit within the chassis of a 1973-1987 Chevy truck. These kits vary significantly depending on the specific Cummins engine (e.g., 6BT, 12-valve, 24-valve), the year of the Chevy truck, and the desired level of customization. Some kits may only offer essential parts, while others provide a more comprehensive selection.
Generally, a kit might include:
- Motor Mounts: Engine mounts are crucial for securing the Cummins engine properly within the Chevy's engine bay.
- Transmission Adapters: These are required to mate the Cummins engine to the existing Chevy transmission or a suitable replacement.
- Wiring Harnesses: Adapting the Cummins engine's electrical system to the Chevy truck's electrical system necessitates a custom wiring harness.
- Hydraulic Lines: If using a hydraulic clutch, special lines will be needed to accommodate the conversion.
- Exhaust System: A custom exhaust system is typically required due to the different engine configuration.
Where Can I Find a 73-87 Chevy Cummins Conversion Kit?
Several companies specialize in producing components and offering support for Cummins diesel conversions. Many parts can also be sourced from various vendors, and a great deal of fabrication may be required. It's crucial to research thoroughly and choose reputable suppliers to ensure quality and compatibility. Note that a "complete kit" is rare; more often you'll need to source multiple parts from various suppliers and potentially fabricate custom components.
What are the Common Challenges of a Cummins Conversion?
The 73-87 Chevy Cummins conversion presents various challenges:
- Fabrication: Significant fabrication skills are typically necessary to modify the engine bay and chassis to accommodate the larger Cummins engine.
- Wiring: Integrating the Cummins engine's electrical system with the Chevy's requires careful planning and potentially custom wiring.
- Transmission Compatibility: Choosing a suitable transmission and obtaining the necessary adapter is vital for successful operation.
- Cost: Cummins conversions can be expensive, requiring significant investment in parts, labor, and specialized tools.
What Year Cummins Engine is Best for this Conversion?
The most common engine used is the 5.9L 12-valve Cummins, known for its durability and relative ease of modification. However, other Cummins engines might also be suitable, depending on your skill level and desired performance. This choice directly impacts the overall difficulty and expense of the project.
What Transmission Works Best with a Cummins in a 73-87 Chevy?
The choice of transmission is crucial. A commonly used option is a NV4500 manual transmission, though other transmissions, such as the 47RE automatic, may also be adapted. Again, adapter plates and custom components are likely required.
How Much Does a 73-87 Chevy Cummins Conversion Cost?
The cost of a Cummins conversion varies dramatically. Budgeting for parts, labor (if not doing it yourself), and potential unforeseen expenses is paramount. It's not uncommon for such projects to cost thousands of dollars, with the price increasing depending on the specific engine, transmission, and the level of customization.
Is a 73-87 Chevy Cummins Conversion Difficult?
The conversion is a challenging project requiring significant mechanical aptitude, fabrication skills, and access to specialized tools. It’s not a job for beginners. While many resources exist online, it's advisable to seek assistance from experienced mechanics or enthusiasts during the process.
Disclaimer: This article provides general information about 73-87 Chevy Cummins conversions. Always consult professional mechanics and refer to specific technical documentation for your chosen components. Safety should be your top priority during any automotive modification project.
