7 bolt head on 6 bolt block HELP!!!

[1970eclipse]

Putting 2g head on 1g block. Using arp head studs. What does the head need to be drilled out to so it will fit the block!!! Help need the size

 

[DSMReviver]

7bolts use smaller head studs. You would need to drill out your 2g head to fit the 6bolt studs.

 

[dsmusmc]

12mm.

 

[1970eclipse]

Do you know what size the head needs to be drilled out too???

 

[dsmusmc]

12mm.