leak at exhaust stud

[geospider]

I have looked at a couple older posts.
I have just gone through this: after the rebuild, had a small leak at what looked like the 2nd stud from the front of the motor. Pulled it out (wasn't that tight), used some permatex high heat thread sealer (white) and a new stud. Actually then leaked more. Now, this stud is longer going into the head. Is that an issue?
I do have the old, stock studs. any ideas? is there a better sealer?

When everything else is just great, this is a pain.

thanks,

geo

[nibbes123]

I use the copper colour permatex which is great for high heat and oils . Works like a charm for me.
Hope this helps
Nick

[geospider]

thanks, ill look for it