73-87 Chevy Cummins Conversion Kits: A Comprehensive Guide
Swapping a Cummins diesel engine into a classic 1973-1987 Chevy truck is a popular project among enthusiasts seeking increased power, torque, and reliability. This guide explores the intricacies of this conversion, addressing common questions and providing insights for a successful build. This isn't a simple bolt-on affair; it requires planning, skill, and potentially a significant investment, but the rewards are undeniable.
What is involved in a 73-87 Chevy Cummins conversion?
A Cummins conversion for a 73-87 Chevy involves more than just dropping in the engine. It's a comprehensive project requiring meticulous planning and execution. Key aspects include:
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Engine Selection: Choosing the right Cummins model (e.g., 12-valve, 24-valve) is crucial, depending on your budget and performance goals. Each model has different power outputs, weight considerations, and associated parts compatibility. Consider factors like fuel economy, maintenance requirements, and long-term cost implications.
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Engine Mounting: Fabricating or acquiring custom engine mounts is essential to secure the Cummins engine within the Chevy's engine bay. This often involves welding and precise measurements to ensure proper alignment and stability.
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Transmission: Selecting and adapting a suitable transmission is critical. The stock Chevy transmission likely won't handle the Cummins' torque, necessitating a more robust option such as an NV4500 or Allison automatic transmission. This usually includes custom adapters and driveshafts.
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Wiring Harness: The electrical systems of the Cummins and Chevy are vastly different. A custom wiring harness is needed to integrate the engine's electronics with the truck's existing systems. This often requires specialized knowledge of automotive electronics.
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Fuel System: Modifying the fuel system is vital to accommodate the Cummins' fuel delivery needs. This might involve installing a new fuel tank, lines, filters, and possibly a lift pump.
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Exhaust System: A custom exhaust system is a must-have. The Cummins' exhaust manifolds and downpipe might not fit the Chevy's frame, so a custom fabrication is usually required.
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Cooling System: The Cummins engine generates more heat than the original Chevy engine, meaning the cooling system needs upgrading to prevent overheating. This could involve a larger radiator, electric fans, and a higher-capacity water pump.
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Driveshaft: A custom-length driveshaft is usually needed to connect the transmission to the rear axle.
Where can I find a Cummins conversion kit for a 73-87 Chevy?
There isn't a single "kit" that contains everything needed for a complete Cummins conversion. Instead, you'll need to source components from various suppliers. Many specialized companies offer individual parts such as engine mounts, adapters, and harnesses, while others specialize in complete engine packages. Online forums and communities dedicated to Chevy and Cummins swaps are valuable resources for finding parts and advice.
What are the common problems encountered during a 73-87 Chevy Cummins conversion?
Several challenges can arise during a Cummins swap. These include:
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Finding compatible parts: Sourcing all necessary components can be time-consuming and require extensive research.
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Fabricating custom parts: Many parts require custom fabrication, demanding welding and machining skills.
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Wiring complexity: Integrating the Cummins' electrical system with the Chevy's can be daunting.
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Cost: Cummins conversions are expensive, requiring substantial investment in parts, labor, and potentially specialized tools.
What are the benefits of a 73-87 Chevy Cummins conversion?
The rewards of a successful conversion outweigh the challenges for many enthusiasts:
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Increased Power and Torque: Cummins engines are known for their substantial power and torque output, significantly improving the truck's performance.
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Improved Reliability: Cummins engines are renowned for their durability and longevity.
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Enhanced Fuel Efficiency (potentially): Depending on the specific Cummins engine chosen and driving style, fuel efficiency can be improved compared to a stock gas engine.
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Increased Value: A well-executed conversion can substantially increase the truck's value.
How much does a 73-87 Chevy Cummins conversion cost?
The cost varies greatly depending on the Cummins engine chosen, the quality of parts used, the amount of custom fabrication needed, and the labor involved. Expect to invest several thousand dollars, potentially reaching tens of thousands for a high-quality, professionally completed conversion. Planning a detailed budget is crucial before starting the project.
This comprehensive guide provides a starting point for anyone contemplating a 73-87 Chevy Cummins conversion. Remember to thoroughly research, plan carefully, and seek expert advice when needed. The journey may be challenging, but the result—a powerful, reliable, and unique classic truck—is well worth the effort.
