Mating a 2G head to a 6 bolt block

[OnMyWayTo12Secs]

Hey all, I have a nice 2G head that I want to install on my 6 bolt block. I am sure I can do it, but need to know how big the head stud holes on the head need to be drilled out to. I thought it was from 11 mm to like 14mm. If anyone knows please respond so I can go to the machine shop this afternoon THANKS

 

[dave99gst]

you open them up by 1mm - machine shop will be able to ream that to prob -
you can just take a head bolt along with you.

 

[Syndicate13]

Stock 6 bolt headbolts fit in the 2G head without a problem, the 6 bolt ARP studs won't. Have the holes enlarged to 12mm.