Horsepower Estimate?

crackedback said

That 391hp 340 article isn't close to reality. Back in the days when that dyno was fairly well know for being extremely happy.

It was the source of a lot of disappointment when people went to the track with the same build and never got that 390-400hp expectation on the slip. Hard lesson.

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Even if so, most of these magazines builds are done by the same people dyno by the same people and are the numbers most are familiar with. Generally when people think 350 hp there thinking in line with these numbers not Joe Blows Dyno Room no matter how more correct his numbers maybe.

Does it matter if Magazine hp is 390 hp, Joe Blows is 360 hp, and 1/4 mile calculator is 290 hp ?
To me as long as we know they equal each other that's all the matters, and generally were not privy to Joes Blows numbers so they don't matter much to me since I don't have access to them.