Yes with today's net system they'd be rated at less horsepower.
I'm not concerned with the stock horsepower ratings. Really just need to know two things. First, can the heads be interchanged? Second, what are the flow ratings of each of the different heads for all the different GMC V6 engines?
Once I get this engine I'll begin my twin turbo fuel injected GMC V6 project. Lets just hope it doesn't blow up on it's first run down the track.
Evil Monkey Kustoms
Jacksonville, IL