Top contenders, considering balance of performance, availability, and ease of installation:
* LS3: A great all-around choice. It offers a healthy amount of horsepower and torque (around 430 hp and 424 lb-ft in stock form), is relatively common and affordable (compared to some others), and is a good size for a classic car without being excessively large or heavy.
* LS376/L99: Similar to the LS3, but often found in slightly higher-trim vehicles, potentially giving you more features and potentially higher horsepower depending on the year and application. This might be a good choice if you can source one for a good price.
* 5.3L (LM7, L33, etc.): These are the workhorses of the LS family. They’re incredibly reliable, readily available, and relatively inexpensive. While not as powerful as an LS3, they’re easy to upgrade with bolt-ons and can still deliver plenty of power for a street-driven El Camino. This is a great option if you're prioritizing budget and reliability.
Considerations when choosing:
* Budget: LS3s are generally more expensive than 5.3Ls. Consider the cost of the engine, transmission, wiring harness, mounts, and installation.
* Desired Performance: Do you want a mild cruiser, a spirited street machine, or a drag strip beast? This will heavily influence your choice.
* Automatic vs. Manual Transmission: Your transmission choice will impact your engine selection. Certain engines may pair better with specific automatic or manual transmissions.
* Available Space: While LS engines are generally compact, consider the space in your El Camino's engine bay. Some modifications might be needed for a proper fit.
Engines to generally avoid for a 72 El Camino unless you are experienced with extensive modifications:
* LS7, LS9: These are high-performance engines, requiring significant modifications to the car for proper fitment and cooling, and are quite expensive.
* Very early LS1/LS6: While these were groundbreaking, later LS engines offer significant improvements in efficiency and power.
Recommendation: For a balanced approach, the LS3 is probably the best starting point. It strikes a good balance between performance, availability, and cost. The 5.3L is a fantastic budget-friendly alternative if power isn't your top priority. Before purchasing, carefully research the specific engine you are considering to ensure it's the right fit for your project. Consult forums and online communities dedicated to LS swaps for more advice.
