Can you use a 2.4 cavalier engine in Pontiac Sunfire gt?

No, you cannot directly use a 2.4L Cavalier engine in a Pontiac Sunfire GT. While both are GM vehicles and might seem compatible, the Sunfire GT came with a specific 2.4L *Ecotec* engine (likely a DOHC version), which is different from the SOHC 2.4L found in many Cavaliers. The mounting points, wiring harnesses, and even the engine's accessories (like the alternator and power steering pump) are likely incompatible. You'd need extensive modifications, if even possible, to make it work, and it wouldn't be a straightforward swap. It would likely be far more cost-effective and easier to find a replacement 2.4L Ecotec engine for the Sunfire GT.