HIPO Heads

I seriously doubt that these were done for or by Shelby American Inc. Shelby used primarily two companies to do the cylinder head modifications, Valley Head Service and Mondello. These heads do not represent the typical work that Shelby had done to his heads, number one being the welding in of the "banana" ports. I have examples of both Valley Head Service and Mondello's Porting Service Shelby cylinder heads. The "SHELBY" letters appear to be very crudely applied also, both Mondello and Valley had very elaborate stamps to apply their respective logos.