[MaxMcQueen]

I'm the recent owner of a Superformance Cobra with a 428 engine built by Southern automotive. They advertisment on the site is saying that their single four barrel 428 engines are able to deliver 460 hp. My car is provided of Edelbrock performance RPM heads as option. I would like to know your opinion if my engine could be really in the 500 hp region with these heads fitted or this could be an insignificant mod.... (they don't claims any improved power for the options list).