Here are some common options and considerations:
* Original Engines: The most common factory engines for a 1980 Chevy Luv were the Isuzu-built 1.6L or 2.0L four-cylinder gasoline engines. Finding a replacement of the same engine is the simplest swap, requiring minimal modification.
* Other Isuzu Engines: Various other Isuzu four-cylinder engines from the same era (and possibly some slightly later ones) could potentially fit with varying degrees of modification. Researching specific engine compatibility is crucial here.
* Small-Block Chevy V8: This is a popular swap, but it requires significant fabrication and modification. You'll likely need custom motor mounts, transmission adapter, potentially a new driveshaft, and possibly modifications to the firewall and body. This offers substantially more power but at a much greater cost and complexity.
* Other V8s: While a small-block Chevy is the most common V8 swap, other smaller V8s might be adapted, though this always requires significant work and expertise.
* Other Four-Cylinder Engines: Other four-cylinder engines from various manufacturers might be feasible, though you'd need to investigate custom motor mounts and other adaptations. Again, this will require careful planning and likely professional help.
Before you decide:
* Consider your budget: A simple engine replacement of the original type will be significantly cheaper than a V8 swap.
* Consider your mechanical skills: A simple engine replacement is possible for a reasonably competent DIY mechanic, but a V8 swap requires substantial expertise or the assistance of a professional.
* Research specific engine compatibility: Check forums and online communities dedicated to Chevy Luv trucks. They are a great source of information about successful engine swaps and the challenges involved. Dimensions, mounting points, and transmission compatibility are all crucial aspects to research.
In short, there's no single answer. The best engine depends entirely on your needs and resources. Start by determining your goals and then research the feasibility and complexity of various engine swaps.