With thousands of cars on display at the 2013 SEMA Show, it’s no easy chore snapping pictures of the best looking, most powerful and genuinely innovative engines. But after walking miles of aisles and peeking under every open hood, we’ve culled 75 of best. To be sure, some truly unique engines could have been missed — there are just too many vehicles to see in one week. However, this engine gallery represents a broad cross section of horsepower, nostalgia and engineering. You can get ideas for dress-up and packaging from these photos, or just enjoy the hardware. Click on any photo for a full-size image.