The dream of swapping a powerful Cummins diesel engine into a classic 1973-1987 Chevrolet truck is a popular one. The combination of rugged reliability and classic styling is undeniably appealing. However, undertaking such a project requires careful planning and a solid understanding of the components involved. This guide will delve into the intricacies of 73-87 Chevy Cummins conversion kits, addressing common questions and providing valuable insights for potential enthusiasts.
What's Involved in a 73-87 Chevy Cummins Conversion?
A Cummins conversion isn't a simple bolt-on affair. It's a major undertaking that requires mechanical aptitude, specialized tools, and a significant time commitment. The process typically involves sourcing a suitable Cummins engine (common choices include the 4BT, 6BT, and 12-valve), acquiring a conversion kit (or assembling individual components), and meticulously integrating the engine into the Chevy chassis. This includes fabricating or adapting motor mounts, modifying the transmission, addressing the driveline, and sorting out the electrical system. Exhaust routing, fuel delivery, and cooling system integration are also crucial aspects.
Where Can I Find a 73-87 Chevy Cummins Conversion Kit?
Unfortunately, there isn't a single, readily available "kit" that contains everything you need for this conversion. Instead, you'll likely find yourself sourcing components from various suppliers. Companies specializing in diesel performance parts and truck customization often carry individual components like motor mounts, adapter plates, and specialized hardware. Online forums and communities dedicated to diesel swaps are invaluable resources for connecting with experienced individuals who can offer guidance and point you towards reliable suppliers. You'll often need to assemble a collection of parts from different vendors to complete the project.
What are the Different Types of Cummins Engines Suitable for this Swap?
Several Cummins engines are popular choices for this conversion, each with its own pros and cons:
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4BT: This smaller engine is a popular option due to its relatively compact size and manageable weight. However, its power output is lower than the larger options.
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6BT: This is a very common choice, offering a substantial increase in power and torque compared to the 4BT, while remaining relatively manageable for the conversion.
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12-Valve: While powerful, this larger engine presents more significant challenges in terms of fitment and weight distribution within the classic Chevy chassis. Careful planning and potentially more extensive modifications are required.
The best engine choice depends on your budget, desired performance level, and your level of mechanical expertise.
What Transmission Options Work Best with a Cummins in a 73-87 Chevy?
The transmission selection is crucial. The stock Chevrolet transmissions are generally not suitable for the torque produced by a Cummins engine. Common choices include various manual transmissions like the NV4500 or the Getrag G360, and automatic options like the Allison 1000. Selecting the appropriate transmission necessitates careful consideration of the engine's power output and your desired driving characteristics. Adapting the transmission to the engine and the Chevy's existing drivetrain will require custom fabrication or the use of an adapter kit.
How Much Does a 73-87 Chevy Cummins Conversion Cost?
The cost of a Cummins conversion varies dramatically depending on several factors: the engine you choose, the quality of parts you source, the extent of modifications you undertake, and the amount of labor you perform yourself versus hiring a professional. A budget-conscious conversion might cost tens of thousands of dollars, while a meticulously crafted, high-performance build could easily exceed $50,000.
What are the Legal Considerations for a Cummins Conversion?
Before starting the conversion, it's essential to research local and state regulations regarding engine swaps and modifications. Some jurisdictions may require inspections and certifications to ensure the vehicle meets emissions standards and safety requirements after the conversion. Failure to comply with these regulations could result in legal penalties.
This guide provides a foundation for understanding the complexity of a 73-87 Chevy Cummins conversion. Remember, thorough research, meticulous planning, and a robust mechanical skillset are crucial for a successful outcome. This is not a project for the faint of heart, but the reward of a powerful, classic truck is often worth the considerable effort.
