I had to do a double take when I saw this.

[sireland67]

I would love to talk to the UAW member that installed a round head bolt in a LA motor that went into a 73 Charger.
The bolt has the hash tag markings, but is completely round, like turned on a lathe round.
And there are no tool makes on the edges.
My luck, at least it is just a core motor for one of my projects.
The motor appears to have never been apart.

 

[Dubob]

Tamper proof? See some odd things over the years.

 

[sireland67]

I have no idea what they were thinking, I hope it comes out easy.

 

[Dubob]

Maybe take an angle grinder with cutoff wheel, pop the head off. Once you pull the cylinder head off it’ll probably screw out with your fingers.

 

[sireland67]

Maybe take an angle grinder with cutoff wheel, pop the head off. Once you pull the cylinder head off it’ll probably screw out with your fingers.

I really don't see how it could be in there that tight, there are no marks on any of the edges.
First attempt I am going to cut a notch across the top, and hit it with a twist impact screwdriver.
Second attempt notch an edge and try to spin it off, with an air chisel.
Third attempt I might weld a nut to the top of the bolt.
I think last resort is cut the head off.

 

[dirty white boy]

looks similer to the seal bolts used on GM 602/604/525 motors for circle track competition....

 

[rustycowll69]

I don't see how it was ever tightened in the first place.

 

[dartfreak75]

I really don't see how it could be in there that tight, there are no marks on any of the edges.
First attempt I am going to cut a notch across the top, and hit it with a twist impact screwdriver.
Second attempt notch an edge and try to spin it off, with an air chisel.
Third attempt I might weld a nut to the top of the bolt.
I think last resort is cut the head off.

Imo 1st I'd notch it and try a flat head screwdriver if that dont work I'd try to drill it a little and try an easy out. Then weld a nut. Last resort cut the head off and try to get the remaining stud loose. I have removed alot of broken bolts from working on guns mostly small scope base screws. But an easy out will always do the trick when a simple slot and punch wont! But I'm sure a head bolt has alot more torque than a scope base screw.

 

[Treblig]

Maybe it's not a head bolt at all......it could be that somebody busted off the original head bolt and fashioned a plug to fill the hole???? I know that the head gasket would probably leak but if they never ran the engine you'd never know??? I don't see any way they could have torqued it???? Treblig

 

[rustycowll69]

Maybe it's not a head bolt at all......it could be that somebody busted off the original head bolt and fashioned a plug to fill the hole???? I know that the head gasket would probably leak but if they never ran the engine you'd never know??? I don't see any way they could have torqued it???? Treblig

that makes more sense

 

[dartfreak75]

Maybe it's not a head bolt at all......it could be that somebody busted off the original head bolt and fashioned a plug to fill the hole???? I know that the head gasket would probably leak but if they never ran the engine you'd never know??? I don't see any way they could have torqued it???? Unless it was some kind of factory thing and they had a special tool to hold it while it was torqued. Idk tho surely noone would plug the hole tho. I would hope not anyways

 

[dartfreak75]

Unless it was some kind of factory thing and they had a special tool to hold it while it was torqued. Idk tho surely noone would plug the hole tho. I would hope not anyways

 

[Treblig]

Unless it was some kind of factory thing and they had a special tool to hold it while it was torqued. Idk tho surely noone would plug the hole tho. I would hope not anyways

If it was a "factory thing" they would have used that type of fastener on all the head bolts not just one???

 

[dartfreak75]

If it was a "factory thing" they would have used that type of fastener on all the head bolts not just one???

Yea I guess so that makes sense. Idk that is crazy.

 

[sireland67]

Maybe it's not a head bolt at all......it could be that somebody busted off the original head bolt and fashioned a plug to fill the hole???? I know that the head gasket would probably leak but if they never ran the engine you'd never know??? I don't see any way they could have torqued it???? Treblig

I guarantee it is not torqued, does not have any tool marks, also there is no way it is a fabricated plug, hard to see in the pics, but the top of what ever it is has hardness hash marks.

I think it may be an actual head bolt, that never got machined for the hex, and made it to the production line.

 

[Treblig]

I guarantee it is not torqued, does not have any tool marks, also there is no way it is a fabricated plug, hard to see in the pics, but the top of what ever it is has hardness hash marks.

I think it may be an actual head bolt, that never got machined for the hex, and made it to the production line.

It's easy enough to find out of it's a plug..... simple get a chisel and a hammer and smack it a few times between the head and the underside of the plug, if it's a plug it will start to come up, if it's not all bets are off???

FYI- If it never got machined for a hex how did they install it and torque it??

 

[el5dart]

id go ahead and weld a nut to it. so your grinder doesnt slip and hit the head

 

[abodyjoe]

That’s funny.

I had a 68 coronet that had a wheel stud that was never threaded. So from day 1 till the mid 90’s when I owned it there were only 4 lug nuts on that wheel.

 

[Dicer]

Just maybe the hex head part of bolt just snapped off the bolt flange?

 

[RAT ROD AL]

I really don't see how it could be in there that tight, there are no marks on any of the edges.
First attempt I am going to cut a notch across the top, and hit it with a twist impact screwdriver.
Second attempt notch an edge and try to spin it off, with an air chisel.
Third attempt I might weld a nut to the top of the bolt.
I think last resort is cut the head off.

 

[Treblig]

Just maybe the hex head part of bolt just snapped off the bolt flange?

View attachment 1715227298

That could be except that when a bolt section is twisted off it usually looks something like this:

The original pic looks to have a smooth surface???

 

[rustycowll69]

That could be except that when a bolt section is twisted off it usually looks something like this:

View attachment 1715227304

The original pic looks to have a smooth surface???

and if it's going to break, it's most unlikely to break at the widest (strongest) section of the bolt.

 

[Dicer]

That could be except that when a bolt section is twisted off it usually looks something like this:

True you would expect that....but you expected a head bolt to be there.

 

[Treblig]

and if it's going to break, it's most unlikely to break at the widest (strongest) section of the bolt.

I agree, the head and flange are the strongest part of the fastener, that's why you check for bolt stretch on "used" critical bolts:

 

[abodyjoe]

@yellow rose how can ya disagree with something you didn't see in person? i owned the car and thats how it was.