I found a exhaust leak coming from the #4 exhaust. So i go to replace the gasket and find that the stud stripped the threads in the head.
How should I go about fixing this? Helicoil? or can I get away with using JB weld?

 

Helicoil it. I wouldn't chance JB given those temps and the importance of a tight clamp on the gasket.

 

Helicoil it.Did my 22re 2wd truck and its pretty much a solid job done.Bought the Helicoil kit # 5543-10 size M10x1.25 and drill size 13/32.Had to use a air drill because of space problem by not removing head.Also a new exhaust gasket installed.

 

I helicoiled it. Didnt have to drill it (I didnt have the right size bit) just ran the tap through.
napa part# 770-3020

 

what is a helicoil?

 

Helicoils are a method of repairing damaged/striped threads. If installed properly, they are generally stronger than the original threads, especially if you are talking about aluminum. I have used them for years, and swear by them.

If you are interested, here is the web site for the manufacturer, they have all sorts of good info on them.

http://www.emhart.com/products/helicoil.html