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Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

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I think the GSX hp was not close to actual. I owned a 69 1/2 Super Bee Six Pack A12 and it was a very close race.
It was actually very close to the Net HP of the motor as opposed to the Gross ratings of the time.

The 400 was replaced for 1970 with the Buick 455 cu in (7.5 L) V8 engine, used in the GS 455. The base model was rated at 350 bhp (355 PS; 261 kW) and 510 lb⋅ft (691 N⋅m; 71 kg⋅m) at 2800 rpm of torque. In the optional Stage 1 trim equipped with a single 4-barrel Rochester Quadrajet carburetor was rated at 360 bhp (365 PS; 268 kW) SAE gross at 4600 rpm and 510 lb⋅ft (691 N⋅m; 71 kg⋅m) at 2800 rpm of torque.[8] As with all American engines produced prior to the 1972 model year, these were SAE gross ratings, which are generally significantly higher than SAE net ratings and are not indicative of what actual production engines produce in their "as installed" condition (with all engine accessories and full exhaust system in place). The fastest magazine test results from this period were obtained by MOTOR TREND Magazine, which managed to extract a 13.38 ET @ 105.5 MPH from their 3,810 pound GS Stage 1 coupe test car. Using Hale's Trap Speed formula, this result indicated actual "as installed" peak HP of approximately 360 SAE Net (ironically the same as its advertised Gross Figure, meaning this engine was very conservatively rated for that time period).