That's pretty interesting Bill thanks. They sure don't look like your everyday smallblock production rods. But your right if they were experimental or prototype's they have the XK/SK number. Were these available over the counter to the average Joe or just for the race teams? I'm surprised there is not more info out there about them?? LOL.

Bobby I'll post anything else I can find also. These are wicked cool rods. I like the odd stuff like this. Geeze you seem to find some pretty good part shashes!!! LOL First the S code fastback and now rare hipo rods!!! If you stumble across any cammers let me know!!! LOL

G.