Horsepower of original 427

[olddog]

Originally Posted by kanuck

I posted this in another thread.

Way back 20 plus years ago I witnessed a dyno run of a NOS 427 that came out of a crate,
it was suppose to be a 425HP version that was "under rated" no matter what carb or how much timing they put into it, the best they saw was 410 HP, so I really don't believe cobras had as much HP as we would like to believe they had, I figure it is just like anything else over the years the numbers just get bigger and bigger, every time the story is told.

Dean

In the mid 1990's the formulas for correcting the Hp for standard sea level atmospheric conditions had likely be revised several times since the 1960's. Remember in the 1960's engineers were still using slide rules and computers were more of a pipe dream. It took a long time to get it right, and some will tell you it still isn't exact.