What size is the distributor hold down clamp bolt?

I cant even get a wrench on it to see what size it is. It is right under the dist, under the ps pump. I cant reach it. I need to go and see if i can find a special bent wrench for it but I need to know what size is it?

What do you guys do for that bolt on 350's?
thanks

Gary

 

I would think it would be the same as a 455....? 9/16 :idea2:

 

I think Mike is right, the bolt is a 3/8 standard thread and should have a 9/16 head....

 

or online here.

http://www.google.com/products/cata...ct=result&resnum=3&ved=0CBsQ8wIwAg#ps-sellers