430 Scuderia broken exhaust manifold head studs

You can centre punch the stud and then use a centre drill to open it out( a lot less chance of it going off centre) a left hand drill is also a handy tool as it sometimes just turns the stud out, saves using a stud extractor

 

That would be the first set I have ever seen that was too warped to surface.

 

35 thou is just short of 1 mm. ( 1 mm =40 thou). So it is a fair bit. If you send me an e mail address i will do you a drawing of how to make a drill guide- less chance of you drilling off centre and ending up in the head material.

 

Could you measure the total thickness of the OEM flange versus the thickness used on the Tubi exhaust manifolds? I presume Tubi uses better materials, I would be curious if they use thicker or thinner flanges.

 

If you ever need to buy ez outs as you call them( we call them stud extractors) look for a parallel set made by Snap On, they look sort of like a reamer. Most people buy these extractors that look like a left hand tapered thread tap and they are not the best idea as they either break or they tend to open up the drilled hole in the stud and then the broken stud gets tighter in say the head material.
The Snap On type are better, as you drill a hole in the stud and you gentle tap the extractor into the hole, it has a barb on it and it grips the inside of the hole- you then drop a collar onto the extractor and turn it out.

 

Yes the snap on ones are the best ones as the link above.
The irwin ones are hopeless as the taper spiral can expand the stud, then they break as the jam up

 

Buy and use the best screw extractors. No room for Chinese crap here.
Use the proper size.
Getting a snapped off screw extractor out requires a carbide bit.

 

Amen. The snap-on/Rigid extractor seems to be the best. The normal reverse thread seems to break bolts by expanding.

I have been watching project farm videos on YouTube and after his review I purchased some sea foam penetrant. I’ll jack the car up one of these days and soak everything thoroughly. I’m in no rush to drive the scud.

Where is everyone buying the manifold studs and is there a part number someone can post?


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Look up the part number from Ricambi America's parts look up. You should go ahead and get new nuts and gaskets as well.

 

Thanks I’ve been looking. Finally found some info on Dans video on replacing exhaust. His are F430 part numbers but I now see they’re used on every F car post 360.


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I would like to see you get a broken stud extractor out with a carbide bit - the cheap extractors are carbon steel and the better ones are HSS and you wont drill either of those materials.
You can try using small centre punch and try shattering it into bits or you use a 2 mm arch welding electrode and burn it out with short strikes.

 

^ Can also hold a nut over the stud with pliers, then fill the center with weld so it connects to the stud. Then unthread with wrench/socket while it's still heated.

 

You have been there as well then ! A pain of a job.

 

Time to buy a lottery ticket! Finally crawled under. Turns out it’s just a simple matter of the stud working at self loose. If you look closely you can see the threads. Went ahead and ordered a few studs and nuts.
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That's a lucky break!

 

Pun intended?


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See if you can find some ceramic high temp anti seize for the new studs- a lot better than copper anti seize

 

Great information. Do you know if they use Inconel for the flange as well?

 

Just a dumb assumption but for those prices I’d doubt it. Hopefully I’m wrong!