Our baseline horsepower and torque ratings are based on testing with the
production-style, normally aspirated injection system. There’s no telling
how much power you can realize with a carefully tuned turbo or supercharger
See page 286 for information on our reference guide P/N 88959384 for installing
This statement is directly out of the GMPP 10 catalog. I think they test them with factory manifolds and stock accsy. such as the water pump and alt. I doubt they have power steering pump or ac compressor on them. Its a bad little motor. I want the 454 crate for my HD truck.