[ERA Chas]

Let me attempt to stop some myths before they become "fact".
My Shelbys cc'd 77.7 cc average across all eight chambers, with less than 1cc total difference.
The exhaust port floor is raised .250", the short turn is improved and of course, 2.250" intakes are arranged to nest in the chamber better than my previously worked iron MR's, which also had 2.250's installed.
Net gain, about 30 HP.
This on my 427" SO. With enough cam and induction 550-580 is about what they'll produce [i]on a 427-sized engine.[I
If Mike LeFevers can chime in here, he will provide expert data since he developed, dynoed and sold them when he worked at Shelby.
I did [i]not[i] buy them for CS signature, correctness or investor value.