LT1-LT4 Modifications 1993-97 Gen II Small Block V8

header bolts

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Old Jan 15, 2010 | 04:24 PM
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Default header bolts

Stupid question I know, but for the life of me I can't remember how long of a bolt I need.....3/4" or 1"? Pretty much the last thing I have to get....

Thanks
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Old Jan 15, 2010 | 04:48 PM
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Stage 8 locking bolts 1" cause 3/4" bolts tend to back out
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Old Jan 15, 2010 | 04:50 PM
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I know you just asked what size and im sure you can use either 3/4 or the 1 inch, i would get these they are the ****. I never had to go back and re tighten them ever
3/4
http://www.ws6project.com/user_stor/...0cd7c669d38f11

1 inch
http://www.ws6project.com/user_stor/...0cd7c669d38f11
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Old Jan 15, 2010 | 04:53 PM
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Originally Posted by 97REaper
Stage 8 locking bolts 1" cause 3/4" bolts tend to back out
I have the 3/4 inch stage 8's and they dont back out. thats what makes them worth the money
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Old Jan 15, 2010 | 05:02 PM
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1" ARP stainless 12 point. no problems
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Old Jan 15, 2010 | 05:07 PM
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Originally Posted by djjab57
I have the 3/4 inch stage 8's and they dont back out. thats what makes them worth the money

True. depends on what headers he's running 3/4'' might not be long enough.
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Old Jan 15, 2010 | 05:28 PM
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I have the 1" Breslin "split lock" stainless which has a + cut in the end of the bolt and is drilled through the middle with a set screw which when tightened causes the + to expand, not allowing the bolt to back out.
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Old Jan 15, 2010 | 06:11 PM
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ARP 400-1209 is the only thing we use
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Old Jan 15, 2010 | 07:22 PM
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I got stage 8 1 inch locking header bolts...2 and a half years and going, not a problem yet...
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Old Jan 16, 2010 | 01:54 PM
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Always go with a 1" bolt. The threads in the head are plenty deep enough for whatever thickness flange your headers have. More thread engagement = more bite = more resistance to backing out.
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Old Jan 16, 2010 | 04:16 PM
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^^^ Agreed.
However w/ my Hooker LT's I use ARP 3/8"X.75" bolts. After tightening twice with new gaskets I've never had a problem.
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Old Jan 16, 2010 | 07:09 PM
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I used stainless 1" Breslin Split Locks, which I believe are now a Percy's product. They won some engineering awards when they came out, and are probably the most innovative locking bolt design.
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Old Jan 17, 2010 | 07:17 AM
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Originally Posted by BTC
I used stainless 1" Breslin Split Locks, which I believe are now a Percy's product. They won some engineering awards when they came out, and are probably the most innovative locking bolt design.
I noticed those, but I'm not a fan of expanding a bolt from the inside out on an aluminum head......I'm just gonna order the Stage 8's unless Larry has them in stock
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Old Jan 17, 2010 | 08:54 AM
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When I was deciding on a bolt, it seemed like a lot of people thought the Stage 8 bolts were a PITA. The consensus seemed to be that the Breslins were the best locking bolt, but the guy who started the company died, and the bolt became almost impossible to find. I believe Percy's picked up the design a couple of years ago. If I had it to do over, I'm not sure whether I would use a locking bolt. I would consider going with the 1" stainless ARP bolts.
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