I don't know a whole lot about the 1K head and I've been offered a fairly worked one by a workmate. Yet to actually see it so I can't say about whats been done to it. I'm pretty sure they fit onto 5K blocks? If so would there be a gain from this or just a waste of time... or actually kill power?
Either way I'll be making some form of meaty K-motor over my holidays coming up, just tossing around some ideas until then.
Cheers.