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How does GM put a HP rating on there engines?

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Old 07-19-2011, 04:08 PM   #1
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Default How does GM put a HP rating on there engines?

So I'm looking to get the LS376/480 crate. But I want to know from a techical stand point that if this crate is rated at 480hp. What dyno test was done to achieve that? Was it dynoed with long tube headers? Were there accessories involved? I think is a great platform to start especially on a budget. So I would like to hear from sponsors and techs!
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Old 07-20-2011, 10:16 AM   #2
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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.
99 Hugger Orange 1LE Camaro A4
New Combo L-92 Block and Heads 416ci
Built by The Head Shop. The heads are fully ported, L76 intake, custom FTI cam and valve train. Tuned by Flaco.Dyno results 508 hp at 5800.
Thanks to Jerry, Shawn,Ed,Flaco,and Richard.

04 2500HD 4x4 The parts Chaser
89 5.0 coupe The 10 year project.
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Old 07-20-2011, 10:16 AM
Pontiac Firebird

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480, block, dyno, engine, engines, find, gm, horsepower, hp, ls376, put, rating, ratings, test, turbos, yahoo

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