North American Turbocoupe Organization

Turbo to Exhanust Manifold Studs &/or Nuts
Pete D Offline
More than one of us has had problems finding new turbo to exhaust manifold studs and nuts that work and don't come loose. This thread is for all to post what they have found for substitutes that work. Please, don't post anything that has less than 20K miles or 2 years in service.

The following was provided by FordTech:

"Standard hardware or even grade 8 will not withstand the high temps generated by our turbo's. I have been using late model cat. conv. hardware designed for that high temperatures. The last package I ordered were a Ford hardware pt# W520103-S403. They come in a package of 4, they are copper/cad plated lock nuts with built in heavy shouldered washer. They have a 15mm hex head. The plus side is I've never had one backoff. The down side is being a lock nut they have to be put on all the way with a wrench or socket. I strongly suggest using in complete sets of 4 to get equall clamping load on the gasket.
Hope this helps, Rick B."

NATO Member. it's not a vice, it's an obsession
Letting the cat out of the bag is a whole lot easier than putting it back in.
88 TC X 2, 86 SVO, mods list at
Pete Dunham


gossamer Offline
Junior Member
cummins makes 10 mm studs and nuts for turbo applications that have worked well for me for the last two years and have not worked loose.

part #'s

turbo stud 3818823

turbo nut 3818824

they both come in a package of four with costs around 15 dollars altogether.

added; go to and search for a distributor or retailer in your area.

[This message has been edited by gossamer (edited 07-17-2003).]

Not B Anymore Offline
Just to update this listing...

I just bought a set of the nuts and studs from Cummins and it was $27.70 altogether in Virginia. Still well worth it.
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels

86 XR7 5spd Offline
Senior Member
good price considering Chrysler wanted 12$ *each* for the studs, back when they were available ...
David T
T5 / ported E3 / .63 / 35# / K&N
2.5" exhaust w/ cherry bomb
30+ mpg! 8.2 0-60, [email protected] 1/4 (gTech)

88TCRider Offline
88 TC 241K:
T3, bored .030 over block and bowl blended, harden seat added, un-cracked head from an 84 TC. Ranger Roller cam, upgraded valve springs, CP forged pistons, self-polished upper and lower intake, mild ported un-cracked E6, cold air intake, bypass valve, looking for 3" exhaust.

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