93 7 Bolt Head On 6 Bolt With Arp Studs:drill Out?

[diamondstargsx]

after a builtd of a 6 bolt build the only good head we have is a late 92 seven bolt.the six bolt has arp studs that will not allow the later 92 7 bolt haed to go on,my question is can i drill on a drill press the head stud holes to the larger 6 bolt size so this head will go on?from looking at the hole size difference you should not have to drill or enlarge all of them.

 

[Suparata]

You should enlarge the head bolt holes. Furthermore you should counter-bore the one that supplies the oil to the head like it is done in this picture http://www.engintecs.com/gallery2/main.php?g2_view=core.ShowItem&g2_itemId=2564

 

[blcknspo0ln]

12mm vs 11mm... just for info sake

 

[92awddsm]

The 1g 7 bolt heads I have seen dont need to be drilled. My 93 head was identical to my 91 head, bolt holes and all. I dont think they changed the bolt hole size in the head untill 95 on the 2g.

 

[bfdahl]

I second the motion, my 93 head bolted to a 90 JDM block.

 

[jdmspilner]

91 block, 93 head. Head got jammed on studs. They will fit with stock headbolts I think but I know from experince it wont fit with ARPs

 

[bryanwheat]

I actually experienced the same thing. Take a round file and make them a little larger, just a little though.