The dream of swapping a powerful Cummins diesel engine into a classic 1973-1987 Chevy truck is a tempting one for many enthusiasts. The combination of rugged reliability and classic styling is undeniably alluring. However, undertaking such a project requires careful planning and a deep understanding of the complexities involved. This guide explores everything you need to know about 73-87 Chevy Cummins conversion kits, addressing common questions and providing valuable insights for a successful swap.
What are the benefits of a Cummins swap in a 73-87 Chevy?
The allure of a Cummins swap lies in the significant performance and durability improvements offered over the original gasoline engines. Cummins engines are renowned for their longevity, torque, and fuel efficiency. This translates to a truck that's not only more powerful but also capable of handling heavier loads and towing significantly more weight. The enhanced reliability ensures fewer breakdowns and reduced maintenance costs in the long run, making it a worthwhile investment for many.
What is involved in a 73-87 Chevy Cummins conversion?
A Cummins conversion is a significant undertaking, far beyond a simple engine swap. It requires careful consideration of several key aspects:
-
Engine Selection: Choosing the right Cummins engine is crucial. Popular choices include the 12-valve and 24-valve variants, each with its own pros and cons regarding power output, complexity, and parts availability.
-
Transmission: The stock Chevy transmission likely won't handle the Cummins' torque. A robust replacement, such as a manual NV4500 or an automatic 47RE, is usually necessary.
-
Transfer Case: Depending on the configuration, you might need a new transfer case capable of handling the increased torque.
-
Engine Mounts and Accessories: Custom engine mounts are essential to properly secure the Cummins in the engine bay. You'll also need to source or fabricate mounts for the alternator, power steering pump, and other accessories.
-
Wiring Harness: Adapting the electrical system to accommodate the Cummins is crucial. This often involves a custom wiring harness or significant modification of the existing one.
-
Fuel System: The Cummins fuel system needs to be integrated into the truck, requiring potentially new fuel lines, a fuel tank, and possibly modifications to the existing fuel system.
-
Exhaust System: A custom exhaust system is required, designed to properly route the exhaust gases and meet emissions regulations (if applicable).
Where can I find a 73-87 Chevy Cummins conversion kit?
While complete "kits" are rare, several companies specialize in providing components necessary for a Cummins swap. These components might include engine mounts, adapter plates, and other crucial parts. However, much of the installation typically involves custom fabrication and expertise. You will likely need to source parts from multiple vendors. Many enthusiasts build their own kits by sourcing parts individually.
What are the common challenges of a Cummins conversion?
Several challenges accompany this type of conversion:
-
Cost: The initial cost of the engine, transmission, and other necessary components can be substantial. Furthermore, labor costs for professional installation or significant time investment for DIY projects should be considered.
-
Complexity: This is not a project for novice mechanics. It requires significant mechanical aptitude, fabrication skills, and specialized tools.
-
Fitting Issues: The Cummins engine is considerably larger than the original engine, requiring potential modifications to the engine bay, firewall, and other components.
What are the differences between 12-valve and 24-valve Cummins engines for this swap?
The 12-valve and 24-valve Cummins engines differ significantly in complexity and performance. The 12-valve is generally simpler, mechanically injected, and easier to work on, making it a popular choice for beginners. The 24-valve, while offering greater power, is more complex electronically and more challenging to troubleshoot. The choice depends largely on your mechanical experience and desired level of performance.
How much does a 73-87 Chevy Cummins conversion cost?
The overall cost can vary widely depending on several factors: the cost of the Cummins engine and transmission, the choice of additional components, the amount of custom fabrication needed, and labor costs (if using a professional mechanic). Budget at least $10,000-$20,000 for a reasonable project, with costs potentially reaching significantly higher levels depending on the extent of customization.
This guide offers a comprehensive overview, but remember that a Cummins conversion is a substantial project requiring thorough planning and execution. Consult with experienced mechanics or experienced enthusiasts within the diesel community before commencing this endeavor. Careful research and preparation are vital for a successful and satisfying outcome.
