one of my arp head bolts wont go all the way down
 

this is on my a6/z6 mini me. i installed the head wit hthe arp head stud, arp lube and 70lbs tq. car ran good, i hgooked up the radiator and oil started mixing with the oil. car ran all of 2 mins. so i pulled the head, decked the head and ordered a cometic head gasket. i took out all the bolts to clean the holes, some of them had moisture in them. i did this one by one returning all the bolts to there proper holes. but theone to the far left in the back sits 1/2 inch hight then all the others. i took it back out, cleaned it again, double checked the hole and it still dosent go down. when i go back outside ill pull that one out and another to check the length to see if there the same. i realy doubt the bolt streched 1/2 inch. anyone else have this issue?

Re: one of my arp head bolts wont go all the way down
 

Using z6 studs I assume?

I had to add some extra washers on the back left one, same one you're talking about. It's held fine for over 2 years, just get hardened washers to be safe.

Re: one of my arp head bolts wont go all the way down
 

That one has a shallower hole I think, because mine was like that too. I just nutted it down and away I went.

Re: one of my arp head bolts wont go all the way down
 

yeah mine is the same on my d15b2/y7 head combo. using the y7 head bolts it sits about a half inch higher as well. so i installed a b2 head bolt in its place and its fine. i thought it was wierd as well. must be something common on the d15's and d16a6 thats not like the z6 on.

Re: one of my arp head bolts wont go all the way down
 

+1

Re: one of my arp head bolts wont go all the way down
 

wow, i dident know it was as wide spred. a couple of threads i looke up on h-t said i should run a tap down the hole. has anyone tried that? i wonder if that caused the coolant leak before i got the cometic gasket. well, if yall think it will be fin i am gonna throw the head on, cuz i dont have access or money for a tap

Re: one of my arp head bolts wont go all the way down
 

I once used z6 arp head bolts on a y8 block/z6 head combo
HELLO WASHER CITY
but it worked

Re: one of my arp head bolts wont go all the way down
 

I doubt you need to run a tap down the hole, you're hitting the bottom of it. Just run a bolt all the way down, clean it off and try again. If the bolt comes out clean you've hit bottom.

Re: one of my arp head bolts wont go all the way down
 

anyone have a picture of how much of the actual bolt shold be showing through nut on the "long" one. so ill know how many washers i need, if any.

Re: one of my arp head bolts wont go all the way down
 

I think I used 4 washers, just buy a few extra.