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Old 02-25-2013, 02:45 PM   #1
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Question True horsepower rating?

Alright, so I wa wondering how does the ls3 compare to the engines of the original muscle cars. Our ls3 is rated at 426 hp, lsa is 580, and in 1970 the ls6 chevelle SS 454 was rated at 450 hp, and the 396 had a 375 hp variation. The difference is how these engines where rated, back then they were measured with our any accessories like power steering, power brakes, etc.. Then those accessory pumps were put on and it was put into the car. Now my question is, how do these modern chevy engines compare to the old muscle car engines, and does any body have an idea on how much hp our engines would make if they were tested in the same manner as the old engines.
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Old 02-25-2013, 03:39 PM   #2
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http://www.superchevy.com/technical/...s/viewall.html
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Old 02-25-2013, 03:58 PM   #3
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Interesting read. The rules were very different back then. Heck as time went on they began to even hide just how powerful some cars were to avoid the insurance rates going completely through the roof.

Now everything goes through standardized tests and we get a clearer picture. They still don't give chassis dyne numbers but the engine numbers are a lot closer to reality.
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Old 02-25-2013, 04:12 PM   #4
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Compared to a stock LS3 Camaro, all but a couple of the muscle cars from back in the day were dog-ass slow. Even 454 Chevelles were only low 13 sec cars... on a good day.

Maybe the only one that could hang would be a hemi whatever and that would assume it was running properly (not likely) and the exhaust was uncorked. Set one up for racing and that would be a different story... but it would also be a car with near impossible street manners.
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Old 02-25-2013, 05:11 PM   #5
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Wish I could find the article, but a couple years a go I think it was Hot rod TV or something of that nature tested a current LS3. The results on an engine dyno without accessories was around 490 HP.
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Old 02-25-2013, 05:27 PM   #6
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Prior to 1972 SAE gross was used as a measurement of HP( no accessories or exhaust ) There is not an exact way to convert SAE gross to SAE net it was the wid west back then cars were tuned and de-tuned to achieve numbers higher and lower. 20% is used to try and compare the two. That would mean the ls3 would probably make around 530 hp SAE gross.
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Old 02-25-2013, 05:30 PM   #7
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so actually if you want cheap (free) horsepower take off your accessories lol if you know how to
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Old 02-25-2013, 05:37 PM   #8
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so actually if you want cheap (free) horsepower take off your accessories lol if you know how to

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Old 02-25-2013, 06:02 PM   #9
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so actually if you want cheap (free) horsepower take off your accessories lol if you know how to
Taking off your water pump, alternator etc. is easy the hard part would be making your vehicle usable.
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Old 02-25-2013, 07:05 PM   #10
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Wow thats an eye opener
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Old 02-25-2013, 07:27 PM   #11
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Wish I could find the article, but a couple years a go I think it was Hot rod TV or something of that nature tested a current LS3. The results on an engine dyno without accessories was around 490 HP.
490 horsepower.....that impressive
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Old 02-25-2013, 08:01 PM   #12
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Im actually suprised that GM inst advertising a higher number, but I guess I shouldnt be because they did the same with the 4th Gen camaros, always underated the v8 power.. That and I'm sure they are saving some HP in the bank so they dont have to do a lot of R&D for future releases.
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Old 02-25-2013, 08:57 PM   #13
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Im actually suprised that GM inst advertising a higher number, but I guess I shouldnt be because they did the same with the 4th Gen camaros, always underated the v8 power.. That and I'm sure they are saving some HP in the bank so they dont have to do a lot of R&D for future releases.
GM not only uses the new SAE procedure, it was Dave Hill (Corvette Chief Engineer) who stongly promoted it as the industry standard.

If you recall back when this happened, many Toyota engines (and others) were lowered.

Dave got sick and tired of people over rating HP so GM no longer over or under rates HP. If you look at the new SAE procedure you will see that it is witnessed and authenticated. No BS.
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Old 02-26-2013, 03:21 AM   #14
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Wow great read, I was really surprised.
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