It made 681HP at the crank and 530HP at the wheels but it was a pretty hot and humid day when we did the pulls at the wheels. Thinking on a nice cool low humidity day it should make 550HP at the wheels.
Here is one of the first pulls where it made 518HP and then we leaned it out a bit to get 530HP. The smoke at the end of the video was from the overflow spitting out down by the left side pipe as the car heated up and the electric fans didn't come on as I pinched the power wire and shorted the fuse when I put the engine compartment inner panels in. Like to dynoed it again this fall when it's much cooler outside and low humidity.
‪Exact 427 Cobra‬‏ - YouTube