I was surfing the net one day, and I ran across this page of a tuning company in japan that took a b210 or 510 and put a dohc head on the motor. I can't remember where I got the videos at, and people elsewhere are asking me about it now. This motor could rev all the way up to 10k and beyond, I believe. If anyone knows where the videos are at, or have any ideas, please let me know.

 

I just found that page with videos:

http://www.datrats.com.au/OS%20GIKEN%20ENGINES.htm