10yrs ago still sealed tight!:cool:

Originally Posted by hummerz (Post 318391)

While under my rig I noticed 1 of the exhaust studs broken where the exhaust pipe bolts to the manifold. Knowing there is a problem with the oe manifold bolts to the head I decided to pull the exhaust manifold.

Original bolts to the head are class 9.8 rating, I'm upgrading to class 12.9 rating studs

First I ordered the parts (from ebay)

VICTOR REINZ Exhaust Manifold Gasket MS19755 $10.99
VICTOR REINZ Exhaust Ring Gasket Victor F32146 $9.45
DORMAN 03142 Exhaust Manifold Stud and Nut $6.00
9 M8 x 1.25mm High Tensile Alloy Steel Exhaust Manifold Stud Kit $20.00

$46.44 TOTAL COST

The Seller Accepted $20.00 Shipped, For The Stud & Nut Kit:

9 Piece M8 x 1 25mm High Tensile Alloy Steel Extended Exhaust Manifold Stud Kit | eBay







Designed for extreme and high temperature applications where failure is not an option!

Obsidian 9 Piece Kit Includes
• Nine Obsidian manifold studs (Class 12.9 alloy steel; M8 x 1.25mm x 45mm)
• Nine Obsidian nuts (Class 10.9 alloy steel; M8 x 1.25mm)
• One 2 gram pouch Loctite C5-A Copper Anti Seize
• Easy to follow instructions


Features:
With a class 12.9 rating and a minimum tensile strength of 1220N/mm2 (176,000+ PSI), these extended studs will blow your mind and surprisingly not your wallet!

Just like our popular InoX stainless studs, these feature a 4mm hex drive in the tip which allows installation with nothing more than a mere Allen wrench, how cool is that?

Each Obsidian stud measures 45mm long to allow fitment of aftermarket exhaust manifolds (especially turbo manifolds) and headers that may have a thicker than OEM flange.
On your intake side, these studs will allow for proper installation of heat shielding gaskets like Hondata, Golden Eagle, Bisimoto, and others as these gaskets are much thicker than OEM and can cause fitment issues.

The nuts are crafted with a built in washer that has serrations on the bottom to resist loosening due to vibrations. This built in washer provides the nuts with a larger surface area for greater clamping pressure to insure a tight fit between your manifold or header and your cylinder head. Better clamping pressure insures a tight and leak free fit for years to come and extended gasket life.

Why only a class 10.9 nut, why not a 12.9 or higher?
This is a question that we've been asked on several occasions. By using a lower class nut on the higher class stud, this insusures that in the event the nut needs to be removed or is over torqued by accident, the threads on the nut will be damaged, not the stud. A damaged nut is easier, faster, and cheaper to replace than a stud. We've put a lot of time and thought into the design and development of our kits and we believe it shows!

Originally Posted by Happy Hummer (Post 408013)

OK lol!
now I'm at a complete loss. Went to search up exhaust manifold bolts and for 07 h3 it keeps coming up with M10 1.50 62mm.
so which is it??