6.7 starter?
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Fleet Mechanic
Joined: Feb 2023
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That's great cause I found a 6.7 starter from a 2024 engine with only 5000kms for only $250 CAD 
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Fleet Mechanic
Joined: Feb 2023
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This doesn't surprise me lol.
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Joined: Dec 2014
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From: Jersey Shore
Yeah, I wouldn’t run only two bolts with a higher torque, higher speed starter that draws more from the batteries.
With the 6.7L starter, the smaller diameter bolt, equal to the other two, can use a simple bushing to potentially reduce any rotational movement.
With the 6.7L starter, the smaller diameter bolt, equal to the other two, can use a simple bushing to potentially reduce any rotational movement.
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Cargo Master
Joined: Dec 2021
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From: Chambersburg, PA
I drilled and tapped the 6.7 starter for the larger 6.0 stock bolt. Just another option for you. Did that about 5 years ago and never looked back. The 6.7 starter makes a good 6.0 starter sound sluggish. Very good upgrade IMO.
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Fleet Mechanic
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Cargo Master
Joined: Dec 2021
Posts: 2,360
Likes: 991
From: Chambersburg, PA
I think the bolts are M8-1.25, but you may want to double check that. If I remember correctly the proper size drill was a letter size (don’t remember which). I don’t have those so I went one fractional size lower. Since the flange was aluminum on mine, I took it slow and it worked out fine.
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Joined: Dec 2014
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From: Jersey Shore
The problem with using the larger bolt is that you cannot get it to its normal stretch without stripping the aluminum threads. Therefore, without some thread locking on the threads or under the bolt head, or by using a longer bolt so a nut can be used on the extended side, there is the potential for the bottom bolt to loosen and be lost. It doesn’t happen often with a 6.0L, but it does, especially with the 7.3L, and things aren’t pretty when it does.
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From: Houston, Texas
Originally Posted by TooManyToys.
The problem with using the larger bolt is that you cannot get it to its normal stretch without stripping the aluminum threads. Therefore, without some thread locking on the threads or under the bolt head, or by using a longer bolt so a nut can be used on the extended side, there is the potential for the bottom bolt to loosen and be lost. It doesn’t happen often with a 6.0L, but it does, especially with the 7.3L, and things aren’t pretty when it does.
A customer called me and said that her truck was stuck in the middle of a field and wouldn't start. She could hear the starter but it wouldn't start. I went over and found the starter dangling below the truck. Upon closer inspection, one of the ears had snapped off due to the bottom bolt being loose and eventually falling out. The top bolt was still somewhat in place but the damage was done.
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Fleet Mechanic
Joined: Feb 2023
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The problem with using the larger bolt is that you cannot get it to its normal stretch without stripping the aluminum threads. Therefore, without some thread locking on the threads or under the bolt head, or by using a longer bolt so a nut can be used on the extended side, there is the potential for the bottom bolt to loosen and be lost. It doesn’t happen often with a 6.0L, but it does, especially with the 7.3L, and things aren’t pretty when it does.