2G Exhaust manifold hardware

[spyderdrifter]

I haven't seen this asked anywhere, but can we use bolts to install the exhaust manifold instead of the studs? I get that the studs are probably used just to keep the threads in the head from being stripped, but why wouldn't the intake side also use studs? Only asking since I have 2 broken studs and can only remove them with an extractor now. But is this a viable idea?

 

[Cherry]

I did it with some socket head cap screws or Allen head bolts since when I rebuilt my engine all the new studs were rusted to the nuts that were also new and the studs just came out entirely. I don't have a problem but I do have a problem with with the next connection where the nuts come off of the bolts no matter what I do. I have a non-turbo though and the only problem is you have to hold the manifold while you start the bolts instead of just sliding them on the studs.

 

[ThunderChild]

Constant heat cycling is harder on the exhaust side vs intake, so studs are a better prevention method for keeping things sealed as expansion and contraction happens. Bolts can be used, but check them often and use nickel antisieze.

 

[motomattx]

I use the Arp polished 12 point bolts, I dont have clearance to pull my manifold away from the head far enough to clear studs as it is and these dont rust or corrode, they are pricey though, you get what you pay for.

 

[Archer Fabrications]

Theres titanium studs out there that won’t rust or corrode, problem solved. Theres a number of vendors out there. I offer them for the turbine fange but not the head flange

For what it’s worth there are studs for the intake side also

The reason studs are better is to protect the head threads, when removing and installing bolts might risj galling the aluminum, nut and stud only puts stressed on a cheap removable part if the studs threads were messed up it’s a lot cheaper tonreplace a stud then tap a head or replace a head

 

[spyderdrifter]

Sadly they're only easier to remove when they're not sheared all the way at the flange like mine. I have to use an extractor on them and hope I don't break the extractor in the process. Thanks for the replies everyone.