1HZ Gturbo install - exhaust manifold problem

[totoro]

I have a 1hz I'm in the midst of adding a Gturbo to. I noticed a peculiarity while pulling off the manifold today. One of the studs is actually just a Toyota bolt. I plan to replace it with a stud but am curious why the shop used a regular bolt and what difference there is between using a stud and said bolt (would it have effected the vehicle?)...

 

[FJBen]

My 13bt which was stock when I took it apart to rebuild, had a couple of Toyota bolts on the manifold. Now whether that was stock or not, i need to check the manual and see what it shows.

 

[KiwiDingo]

Studs will always be more effective at holding torque and getting torqued than a bolt but for an exhaust manifold I wouldn't be too worried, it's not like it's a head stud. I used bolts instead of studs on my exhaust manifold to turbo flange and have had years of zero issues

 

[roscoFJ73]

One of the reasons they use studs is so the thread inside the head/block doesnt get worn or damaged . The nut comes off, releases the manifold and leaves the stud in the head.
The one who has to remove the stud if it gets stuck will most likely be a machinist doing a head repair.

 

[IanB]

One of the reasons they use studs is so the thread inside the head/block doesnt get worn or damaged . The nut comes off, releases the manifold and leaves the stud in the head.
The one who has to remove the stud if it gets stuck will most likely be a machinist doing a head repair.

Most of the studs came out with the nuts seized on them when I did my original turbo install, truck had only been here for 4 years at the time, zero rust/corrosion prior. I ran a tap through the holes and installed new studs and nuts when it went back together.

 

[totoro]

Quick update - got all the studs out (turned out they weren’t too bad since I had everything rebuilt 20k ago) and new studs in. Got the manifold and gturbo mated and just ordered the slide pieces, including rings etc, to connect big and small manifolds. I didn’t realize that was needed. Plan to connect those by end of week and get the new turbo and everything else buttoned back up

 

[totoro]

Quick question - can I run my set up for an hour to an exhaust shop without any exhaust or will it melt everything around the area?

 

[IanB]

You'd want a downpipe to route it below the truck at the very least, whatever's in the path of that exhaust is going to get very hot, and very black.