If you're planning to either replace or swap out an engine, it's not going to be cheap. On average, you could be spending as much as $4,000 on a 4-cylinder engine, and that's just the bare minimum. V6s and V8s will naturally cost more. However, there are ways that you can reduce the cost of a new engine. For example, some have recommended going for used engines instead of brand new ones. These can be bought from scrapyards for as little as just $500. Although, their quality and condition will be questionable, at best. At the very least, you're still looking at $1,500 to $2,500 for a decent enough, low-spec engine. Meanwhile, specialty engines are incredibly costly. For example, a highly-tuned Spoon engine for a Honda costs between $9,000 to $15,000.