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post #1 of 5 Old 02-22-2016, 01:03 PM Thread Starter
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on3 Header Hardware question

I bought a used on3 kit, have my stock header bolts from my old headers but the turbo flange is much thicker, almost 3/8s. The hardware only threads in 2-3 threads. Does anyone know of a hardware kit slightly longer and retains the 12 pt heads?

I could always run to local hardware store and pick up some grade 8 bolts few mm longer, but not with the 12pt heads.


92 GT Hatch - GT40P, F303, Headers, H-Pipe, 3:55s etc.
271 rwhp 299.8 rwtq

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post #2 of 5 Old 02-22-2016, 04:48 PM
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ARP header bolts. I'd have to measure them to get you the length on it, but it's basically just a longer length header bolt. Find the length you need, and order the ARP set.


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post #3 of 5 Old 02-22-2016, 05:49 PM
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I'd look into Stage 8 locking header bolts. You can get them in 12pt. Once setup they are not backing out.
Stage 8 Locking Header Bolt Kits - 12-point Head Style

I've used them in the past with very good results.

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post #4 of 5 Old 02-22-2016, 06:26 PM Thread Starter
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The stock length is 3/4, arp come in 3/4 but no longer I saw. The stage 8 does come in 1 inch but are pretty expensive, time to pony up some cash I guess.

92 GT Hatch - GT40P, F303, Headers, H-Pipe, 3:55s etc.
271 rwhp 299.8 rwtq

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post #5 of 5 Old 02-23-2016, 08:35 PM
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Summit has a huge selection of header bolts. I have gotten 12 point 1" long header bolts there before. Not too much money either.

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92 coupe, coyote 5.0, turbo, manual trans, project in progress....

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