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99 Cadillac STS
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51 Posts
Discussion Starter · #1 ·
Hey Guys,

can anyone tell me what size torx is needed for the head bolts on a Northstar ? I can't remember.
 

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Super Moderator
2010 DTS
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88,456 Posts
Head bolts are not held on with Torx head bolts. They use regular hex heads, though I don't know what size they are.
 

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2001 eldorado,2008 DTS,2005 XLR, ','95 eldo,' ,'11CTS-V,'66 corvair.'03 deville,'00 deville
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2,098 Posts
I think Ranger means hex as in ALLEN hex, not Torx. It's 10mm.
 

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2002 F55 STS, 2014 Explorer XLT, F-150s
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74,556 Posts
Torx is one thing, Allen is another, and the Northstar standard hex head Grade 8 bolts are another.

The cylinder heads use 2 M6 and 8 M11 bolts.
 

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2001 eldorado,2008 DTS,2005 XLR, ','95 eldo,' ,'11CTS-V,'66 corvair.'03 deville,'00 deville
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2,098 Posts
Every Northstar I've worked on had round-headed headbolts (ten /head), and an Allen keyed hole in the bolthead that took a male hex (10mm)tool to remove. I think that's what the origional poster was looking for; the tool size to remove the bolt. The thread size is M11.
 

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Administrator
2002 F55 STS, 2014 Explorer XLT, F-150s
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74,556 Posts
OK..........Earth to James.......The 3 M6's are hex head, the 10 M11's are internal drive.
 

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Super Moderator
2010 DTS
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88,456 Posts
Now I'm thoroughly confused. Guess I should go out and check the FSM, but I was in the garage all day working on my wife's compressor clutch and am just to bruised, bloodied and battered to get up. I'll just stand corrected.
 

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Registered
99 Cadillac STS
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51 Posts
Discussion Starter · #8 ·
Hey thanks for the replies, I've confirmed calling a local cadillac service department it's a 10mm Allen


Thanks

-Rob
 
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