What to fill holes on gt40 Aluminum heads?

[green95gt]

There are a few treaded holes on my gt-40y aluminum heads. I'm pretty sure they are for emmisions stuff. Since my mustang has no emmisions equipment on it, does anyone know where I can find inserts for these holes?
Thanks in advance.

 

[CManT1914]

They're called thermactor plugs. Your local ford deal will have them, or you can order them from summit here:

http://store.summitracing.com/defau...earchinresults=false&N=0&target=egnsearch.asp

You'll need two, one for the back of each head. Your accessories also bolt into these, so if you don't have them already in the front, you might need two more for the accessories to bolt to.

 

[blackstangt]

I actually went to a local parts stoe and got plugs for them which were tightened with an allen wrench, got the size from the long ac stud

 

[green95gt]

Thanks, I'll order a set toady.

 

[stroked8e5]

I just plugged them off with an allen bolt.

 

[2000xp8]

It's a stocked item, so just goto your ford dealer and get them.

 

[5spd GT]

You will need a threaded insert known as a thermactor plug. They screw into the back and front of your heads. Put silicone on the threads to prevent any exhaust leak when installing them. The thermactor plugs you will use for the front (same as back) will go to make the head holes smaller so the accessories can bolt up like your power steering stud and one of your bigger alternator bolts that go through you alternator bracket. The back thermactor plugs you will use just block off and delete the smog equipment’s previous hookups. You can get them at a Ford Dealership - part # F4ZZ-6E086-A or you can buy some from Summitracing - part # TFS-51400265 and they run anywhere from $3 to $12 dollars from what I have seen. Summit has them cheaper.

 

[troyGT03]

You will need a threaded insert known as a thermactor plug. They screw into the back and front of your heads. Put silicone on the threads to prevent any exhaust leak when installing them. The thermactor plugs you will use for the front (same as back) will go to make the head holes smaller so the accessories can bolt up like your power steering stud and one of your bigger alternator bolts that go through you alternator bracket. The back thermactor plugs you will use just block off and delete the smog equipment’s previous hookups. You can get them at a Ford Dealership - part # F4ZZ-6E086-A or you can buy some from Summitracing - part # TFS-51400265 and they run anywhere from $3 to $12 dollars from what I have seen. Summit has them cheaper.

exactly what i was going to say. the bolt thing will work but the plugs from ford are the better way to go. just use anti-seize on them for later if you swap the heads to either side.

 

[1bad92lx]

These thermactor plugs will work in AFR 165's won't they? My holley heads came with them and my AFR's came with nothing except the instruction sheet. I have to plug the smog holes because I will be using a smog eliminator when I put the heads on.

 

[5spd GT]

Yeah they work in the AFR's...they worked in mine The Ford ones did for sure...