I agree the GTO 455 really was the same as the 370 HP engine used in the larger cars. Make no mistake though: The '70 Olds W-30, made much much more than 370 HP ( I've read 410-420 ), and would soundly out mph a ( '70 ) 455 GTO in the 1/4 mile, especially the manual trans ones with the wilder cam. The 370 HP is just the usual fudging of 10 lbs/hp limit GM put on their non-Chevrolet intermediates.
Buick's "360 HP" Stage-1 was another in that category. Funny reading the more naive testers stating that the somewhat underwhelming 360 HP number is offset by the 500 lb/ft of torque@2800. Baloney. No way will 360 ( SAE gross ) HP power a heavy Buick GS through the quarter at 103 MPH, regardless of the torque reading. It may have actually made 360 HP @ 4600, but it was not the peak. That's another 425 HP monster.
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