Tim posted a real good link in another thread where we were discussing head torque. I won’t quite it, they say it better than I ever could. Take a look at this site and it will answer all your questions on flatness. http://www.valvedirectory.com/valve_04122006.html

Oh, and on the straight edge, they are talking about a precision straight edge, not a carpenter’s square. The machine shop will have that, best to let them check it, I doubt if you want to put out that kind of money just to check the one engine.
http://catalog.starrett.com/catalog/catalog/groups.asp?GroupID=396
http://www.use-enco.com/CGI/INLMK32?PARTPG=INSRAR2

Here is the one that I use; http://rides.webshots.com/photo/2254296400098611668WnQoDO
Denny Graham
Sandwich, IL

Last edited by Denny Graham; 01/16/2008 2:27 PM.

Denny G
Sandwich, IL