I think the Pontiac enthusiasts missed the point of that story……..and that the motor in question was not a SD that was getting a rebuild.
It was a bread and butter 455 that the owner wanted built to the 500hp mark.
Shop A failed the test with a 315hp effort.
My question to the installation shop was, why did the owner accept it like that?
Nothing about the build was what he had asked for.
When the builder showed him the dyno sheet the owners response should have been, “call me when you find the missing 150hp”.