I might be building a forced induction engine, and of course I know that ARP makes a head stud kit, but I was wondering what size/pitch are the stock bolts?

I've done a Google search, and Yahoo search with no luck.

 

Anybody?

 

I want to say M11x1.25? Its an oddball. ARP makes a thread chaser (kinda like a tap) for cleaning out the threads in the block. At ~$50 or so, they aren't cheap. Especially for a "one time use" kinda tool.