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IIs it possible to put a 1990 Buick 3800 engine in 1994 BMW 740 IL?

No, it's highly unlikely you can directly swap a 1990 Buick 3800 engine into a 1994 BMW 740iL. Here's why:

* Engine Mounts and Placement: The 3800 is a front-wheel-drive engine designed for a different chassis layout than the rear-wheel-drive 740iL. The engine mounts, transmission connection, and overall physical placement would be completely incompatible.

* Transmission Compatibility: The 3800 is likely paired with a front-wheel-drive automatic transmission, while the 740iL uses a rear-wheel-drive automatic. These transmissions are designed for different drivetrains and are not interchangeable.

* Electronics and Wiring: The engine management systems, sensors, and wiring harnesses between these cars are entirely different. You'd face a massive challenge trying to integrate the Buick system into the BMW's electrical system.

* Engine Management System: The 740iL uses a sophisticated engine management system, likely with electronic throttle control and other advanced features that won't be compatible with the Buick engine's control unit.

* Cooling System: The cooling system layout and plumbing will differ significantly between the two cars.

* Exhaust System: The exhaust system, including headers and manifolds, will be completely incompatible.

* Other Compatibility Issues: You would need to address everything from steering components to suspension geometry to accommodate the engine swap.

Even if you somehow managed to overcome these hurdles, the swap would be extremely difficult, time-consuming, and likely very expensive. You would need extensive mechanical expertise, fabrication skills, and access to specialized tools and parts.

Instead of attempting this complex swap, consider these options:

* Rebuild the BMW engine: This is the most likely to maintain the car's integrity and performance.

* Find a used replacement engine: Searching for a used BMW engine from a similar model year is a viable option.

* Upgrade to a modern engine: If you're looking for more power, consider exploring engine swaps with more modern BMW engines that are compatible with the 740iL's platform.

Remember, any major engine swap should be done by a qualified and experienced mechanic.