I don't know if anybody caught this article in popular science a few months back
http://www.popsci.com/popsci/futurec...cbccdrcrd.html

It seems like quite a few of you have an extra cylinder head lying around, I wondered if anybody thought about trying this with one of our 2 cylinder engines.

Here is a link to this guys webpage if you want more information
http://somender-singh.com/

It's a pretty good article, I think PopSci gives it some credibility.