[Alan Roehrich]

Dustin, on the NHRA website, look for the link at the top that says "rules", under that you'll see the stock car classification guide, and the engine blueprint specifications. In the engine blueprint specifications you'll see what castings you can use, and what the specifications are. In the classification guide you'll see what the NHRA HP ratings are. I'd say that if you can use the aluminum heads, it'll increase the NHRA HP rating.