Quote:
Originally Posted by JR 1
Interesting graphic GM put out.
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It's interesting, but not very accurate.
GM did build 425 and 430 horsepower Camaros in 1969.
All the 67-70 engines were rated in SAE Gross Horsepower.
Since 1972, all engines have been rated in SAE Net Horsepower.
In 1971 all engines were rated in both SAE Gross and Net Horsepower.
SAE Net ratings give much lower numbers than SAE Gross ratings.
As an example the horsepower rating on Z/28 Camaros went from 330 Gross Horsepower in 1971 to 255 Net Horsepower in 1972, with absolutely no changes to the engine.
The end result of this is that a LS3 Camaro is making more than just 1 horsepower more than a 1969 COPO 427 Camaro, a LOT more.
Today's LS3 would be making around 500 horsepower if it were rated in SAE Gross Horsepower.
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Last edited by Rocky1974; 02-16-2015 at 03:54 PM.
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