David, XHP-260 and HP260 engines would be tough to cover in little text boxes. Cylinder heads were prototype racing casting used in no other engine. Everything in those head assemblies was unique to them and not based on any other engine. In all these decades I have seen one pair not in an engine. Connecting rods were prototype race forgings and assemblies. I have seen five not in an engine, the XHP-260 camshaft was a strange Ford/Sullivan/Potvin creation that cannot be cut from any other Ford design, the HP260 camshaft is what the HP289 was later based on. So on and so forth. Evidence suggests that only 35 each XHP-260 engines were built. At least 137 each HP 260s were made and probably more. Ford spent hundreds of thousands of dollars making the small numbers of racing 260 engines. I know of one XHP-260 and one HP260 still mostly complete in original condition.
Aluminum case transmissions did not arrive until CSX2136-CSX2138 were being completed.
Dan, I stumbled across your posts on Club Cobra regarding Ford HP260 engines. I have the remains of Cobra 260 CSX2014, which you mentioned in one of your posts. I have been casually searching for obtainable parts, such as a Ford 260 engine block. I believe you mentioned it should have a casting number as C2OE-6015J. Are these the 100 competition engines Ford made for Shelby and Holman and Moody? I am also looking to find the correct casting numbers for a pair of 260 heads. And, I am looking for a T10 transmission, however, I believe the transmission for CSX 2014 may have had an aluminum tail housing. Any information would be greatly appreciated. Thank you, David Grant
