Head stud?
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
This... You have to helicoil them, but you can make 1/2" studs work in a 6.9....
That being said, nobody that I know of has blown a HG on 7/16" studs at any regular amount of fuel, so you should be fine with standard studs....
That being said, nobody that I know of has blown a HG on 7/16" studs at any regular amount of fuel, so you should be fine with standard studs....
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Elder User
Joined: May 2011
Posts: 973
Likes: 2
From: Bellefontaine, OH
Idk what psi my buddy is hitting but with a fresh ip, injectors and a built turbo he has blown 3 head gaskets and stretched the studs out... I'm not going very mild so I don't want to deal with repeatedly replacing head gaskets
Postmaster
Joined: Aug 2010
Posts: 2,554
Likes: 7
From: Northern Arizona
Something else is wrong... he has a head/deck machining issue and/or he is not installing the studs correctly. ARP studs should hold at the fuel/boost levels available for an IDI... even a built one.
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
There is some sort of other issue... We have seen 40+ psi boost, and 365whp/685wtq with 7/16 studs on NMB2's build.... Either he isn't doing it right, or has some sort of flaw in the head/block surface...
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Elder User
Joined: May 2011
Posts: 973
Likes: 2
From: Bellefontaine, OH
I have seen nmb2's build thread and I thought he had a couple head gasket issues?.. But I understand and thank you everyone for keeping me from wasting $$$ on that!
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