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Primary Bolt Depth

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Old Jan 9, 2023 | 04:59 PM
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Default Primary Bolt Depth
I want to switch out my primary hardware with ARP 12pt bolts. The spec from the MoCo says that the shorter bolts are 1/4-20 x 1 3/8" but ARP doesn't make one. Can I safely drop in a 1/ 1/2" bolt? Has anyone done that?
 
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Old Jan 9, 2023 | 07:00 PM
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Cut off the 1/8" . Put a thread chaser on, cut the 1/8" off, round the edge on a wheel, take the chaser off to fix the end thread. Or use washers.
 
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Old Jan 9, 2023 | 09:33 PM
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Nevermind!
 
Last edited by OldEnuf2NoBtr; Jan 9, 2023 at 09:40 PM.
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Old Jan 10, 2023 | 08:48 AM
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Originally Posted by chopper_man
Cut off the 1/8" . Put a thread chaser on, cut the 1/8" off, round the edge on a wheel, take the chaser off to fix the end thread. Or use washers.
Yeah, I suppose that's the best option. I guess we'll see what it takes to cut an ARP bolt.
 
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Old Jan 10, 2023 | 09:03 AM
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Do you have a grinding wheel? Thread a nut on the bolt up 1/8". Grind the protrusion off and restore the threads by unscrewing the nut.
 
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Old Jan 10, 2023 | 09:08 AM
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Originally Posted by John CC
Do you have a grinding wheel? Thread a nut on the bolt up 1/8". Grind the protrusion off and restore the threads by unscrewing the nut.
I do and I've cut bolts before, just not an ARP "super hardened super bolt", know what I mean? I just need to make sure I have a fresh cutoff wheel and I should be good. It's just a 1/4" bolt anyway so shouldn't be a problem.
 
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Old Jan 10, 2023 | 09:21 AM
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Originally Posted by snake_eyes
I want to switch out my primary hardware with ARP 12pt bolts. The spec from the MoCo says that the shorter bolts are 1/4-20 x 1 3/8" but ARP doesn't make one. Can I safely drop in a 1/ 1/2" bolt? Has anyone done that?
Are you sure....??

I have three Twin Cam bikes with ARP 12pt stainless bolt kits from Alloy Boltz...

While I didn't measure the replacement bolts (maybe they sent 1-1/2" bolts???), they supplied bolts that just swapped right out with OEM...

https://alloyboltz.com/harley-kits/
 
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Old Jan 10, 2023 | 09:31 AM
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Originally Posted by hattitude
Are you sure....??

I have three Twin Cam bikes with ARP 12pt stainless bolt kits from Alloy Boltz...

While I didn't measure the replacement bolts (maybe they sent 1-1/2" bolts???), they supplied bolts that just swapped right out with OEM...

https://alloyboltz.com/harley-kits/
Cool site, but it's hard to tell what the kits are. I don't see a primary set for my '17.

 
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Old Jan 10, 2023 | 10:09 AM
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Originally Posted by snake_eyes
Cool site, but it's hard to tell what the kits are. I don't see a primary set for my '17.
Call those guys, they will fix you up quickly. I called them and got the exact bolts that fit my bike.
 
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Old Jan 10, 2023 | 11:36 AM
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Originally Posted by snake_eyes
Cool site, but it's hard to tell what the kits are. I don't see a primary set for my '17.

It was included in the engine kits I bought....

As mentioned by NEWROADSTER, call them, they should be able to hook you up....
 
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