i'm rebuilding a k20a engine but unable to locate the main and con rod bearing clearance spec i'm sure if you can help, thaks in advance.

 

Try the RSX Forum. Most of US have B series engines.

 

Also, you may get more concise detail from K20a.org forums. There's a lot of technical info there, and if you can't find it, someone will get it for you. There's great bunch of guys there....forewarning, there have been a few more h-t'er type of post/posters there recently, though.