A nice take on the challenge, and an interesting angle that shows the engine well. I think a good cleaning of the engine would make this a better shot. And, of course, a V-8 engine with bright chromed valve covers would better illustrate the muscle of an American super-powered car.
I get the theme, it meets the challenge but this comes across as a simple snapshot. If I had to shoot this subject I might have zoomed in very close on one part of the engine as a macro shot and really picked up on the textures.
Very low contrast and uninspiring lighting. Unless you're a mechanic, I don'th think the image shows "power", as most of us don't know what we're looking at (okay, it's a V8 with a carburettor engine, but that doesn't help much...)