I've searched around and everyone says use a straight edge to see if your head/block is warped. What I'd like to know is if this is the right kind of straight edge:
http://www.sears.com/sr/javasr...76000

... or is there a more accurate machinist kind of straight edge out there? if so where can I get a hold of one? Thanks.

 

thats what i use

 

my buddy uses a 200 dollar precision machined straight edge that a machinist made for him

 

i bought a starret one for like $80 from rutland

http://catalog.starrett.com/ca...=Spec make sure you keep it oiled!!