Where to find correct 302 serpentine belt bolts for E7

[Geiri]

So my 302 heads have different bolt threads
The red once are 7/16 I believe the 2 other are 3/8
Where would be the best place to find the correct length?
I am told those are the Ford E7 heads from a 1995 Mustang
And if you know what size plug goes into the front of the head?

 

[DirtDonk]

That is an explorer serpentine set up. Correct?
If so, did you get any bolts for the brackets with the rest of the parts? And are they all the wrong size?
Or do you not have any of the original bolts?

 

[Geiri]

That is an explorer serpentine set up. Correct?
If so, did you get any bolts for the brackets with the rest of the parts? And are they all the wrong size?
Or do you not have any of the original bolts?

I was told it was a Explorer serpentine set up. I got only the two bolts shown with it.
What bugs me is the different sizes of threads on the heads. 4 bolts have smaller diameter than the other 2.
But the holes in the Brackets are all equal size. For the larger bolts. I am not really Shure how that is best dealt with??

 

[EPB72]

Does the third hole on the accessories brackets even line up with the 3/8 hole when the other two bolts installed . ??? from the picture the third used threaded hole should be where the larger hole/exhaust port for air injecton maniflod is,,,, What is the bolt hole configuration on the back side [firewall end ]of those heads/,,.....first thought the heads need to be swapped side to side and you need to find a way to plug off those exhaust ports....I maybe wrong but thats what appears to be the case.

 

[SteveL]

If you have a list of the sizes and lengths you can hit the local hardware store and get some grade 8's or if you want pretty summit sells individual arp's

 

[tasker]

THIS^ when I did mine I just went piece by piece, tractor supply and done

 

[jamesroney]

So my 302 heads have different bolt threads
The red once are 7/16 I believe the 2 other are 3/8
Where would be the best place to find the correct length?
I am told those are the Ford E7 heads from a 1995 Mustang
And if you know what size plug goes into the front of the head?

@Geiri You have made a small blunder. I think I can help you.
Fortunately you have provided a picture, so I can see your problem.

The E7 heads have 4 threaded holes in each end. I have labeled them for you in your picture.
Hole #1 is a 5/16-18 blind hole for the retention of the Thermactor cross over tube. It is not used in your Bronco.
Hole #2 is a 7/16-14 blind hole.
Hole #3 is a 7/16-14 blind hole.
Hole #4 is a 5/8-11 threaded THRU hole for the Thermactor air injection.

Hole #4 is special, and is the one used by the accessory brackets. It NEEDS to have a 5/8-11 to 7/16-14 threaded insert plug installed.
You will find that you have the threaded insert plugs in the back of your heads...because you put the heads on BACKWARDS. So your threaded plugs are in the back, instead of where you need them up front. This is no problem, but you must obtain 2 new inserts. You want Ford part number F4ZZ-6E086-A or an equivalent. You can get them from Amazon by seraching keyword: "Thermactor Insert"

If you do not plug the hole, it is a big exhaust leak. The old threads will be full of carbon residue, and will require a tap to clean the threads prior to the insert installation.

 

[Geiri]

@Geiri You have made a small blunder. I think I can help you.
Fortunately you have provided a picture, so I can see your problem.

The E7 heads have 4 threaded holes in each end. I have labeled them for you in your picture.
Hole #1 is a 5/16-18 blind hole for the retention of the Thermactor cross over tube. It is not used in your Bronco.
Hole #2 is a 7/16-14 blind hole.
Hole #3 is a 7/16-14 blind hole.
Hole #4 is a 5/8-11 threaded THRU hole for the Thermactor air injection.

Hole #4 is special, and is the one used by the accessory brackets. It NEEDS to have a 5/8-11 to 7/16-14 threaded insert plug installed.
You will find that you have the threaded insert plugs in the back of your heads...because you put the heads on BACKWARDS. So your threaded plugs are in the back, instead of where you need them up front. This is no problem, but you must obtain 2 new inserts. You want Ford part number F4ZZ-6E086-A or an equivalent. You can get them from Amazon by seraching keyword: "Thermactor Insert"

If you do not plug the hole, it is a big exhaust leak. The old threads will be full of carbon residue, and will require a tap to clean the threads prior to the insert installation.

That is super helpful. Thank you so much

 

[Geiri]

@Geiri You have made a small blunder. I think I can help you.
Fortunately you have provided a picture, so I can see your problem.

The E7 heads have 4 threaded holes in each end. I have labeled them for you in your picture.
Hole #1 is a 5/16-18 blind hole for the retention of the Thermactor cross over tube. It is not used in your Bronco.
Hole #2 is a 7/16-14 blind hole.
Hole #3 is a 7/16-14 blind hole.
Hole #4 is a 5/8-11 threaded THRU hole for the Thermactor air injection.

Hole #4 is special, and is the one used by the accessory brackets. It NEEDS to have a 5/8-11 to 7/16-14 threaded insert plug installed.
You will find that you have the threaded insert plugs in the back of your heads...because you put the heads on BACKWARDS. So your threaded plugs are in the back, instead of where you need them up front. This is no problem, but you must obtain 2 new inserts. You want Ford part number F4ZZ-6E086-A or an equivalent. You can get them from Amazon by seraching keyword: "Thermactor Insert"

If you do not plug the hole, it is a big exhaust leak. The old threads will be full of carbon residue, and will require a tap to clean the threads prior to the insert installation.

Do you use some sealant on the plugs and bolts before assembly?

 

[jamesroney]

Do you use some sealant on the plugs and bolts before assembly?

The Ford service part uses a pre-applied thread sealant on the external thread of the insert. I believe that a small dab of thread locking compound would be just as effective.

There is no chance of prolonged leakage, as the soot and carbon from the exhaust is self-sealing. Getting them installed correctly is far more difficult than any chance of leakage. I have built a small adapter to fit over a 7/16-14 bolt to engage the drive slot to get it tight and sunk in the hole. But recently I purchased the Amazon brand without any sealant, and applied my own Loctite 262 and it threaded easily with a large screwdriver.

No sealant on any other bolts. A light coat of nickel based anti-sieze will be appreciated by the next person that must work on it.