Scott, I could not find any info on anyone other than Steinbreck using a tunnel port head for Prostock. I did find some info on a 351 Ford with what they called a split port tunnel port design head. Kind of like what I have done with my heads. The guy claims it made 1023 HP. I could not find much more about it, except he claims it was outlawed because it gave the Ford boys an unfair advantage in Nascar. The heads were actually a Ford part in their motorsports catalog as recently as 1996. I know Tom V made mention of them, but other than that I could not find anything else about them. Does anyone know who the guy was that worked on this program for Junior Johnson? If so, I would love to get the guys number or email.
Don Johnston
DCI MOTORSPORTS INC.
330-850-5050 shop
330-628-3354 cell
Designer of the DCI Tiger Heads and the NEW DCI Ram Air 5 Heads !!!!!
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