Man, i didn't know that asking what type thread sealer/Gasket/RTV to use could resemble another oil thread but ...
I started a thread in the engine folder in January and resurrected it about a week ago.
http://67-72chevytrucks.com/vboard/s...=1#post6655217
The problem i have is My intake gasket ends up getting saturated with coolant, last time I replaced them I used black RTV on the bolt threads and i believe that after it hardened i re-torqued them and broke the seal, plus probably not the best for antifreeze resistance. I cant remember what i used the other times
A friend at work said use Permatex thread sealer with Teflon in it, I found this stuff but it say's you only have 4 hours before it sets if you have to re-torque, i don't work fast and may not be able to heat cycle and re-torque in that amount of time:
http://www.permatex.com/products-2/p...sealant-detail
I'm also thinking back old school and checked out a can of Permatex Hi-Tack, it is non hardening, won't desolve with oil or antifreeze and say's its excellent for sealing threaded fittings. I like this because it looks like it will allow more than 4 hours for re-torquing and i usually only get a couple hours a day to work on stuff, i want to install the intake, let it sit over night then fill with coolant and fire it up, then re-torque.
http://www.permatex.com/products-2/p...sealant-detail
So unless someone chime in ans say's i'm making a huge mistake I'm leaning toward choice number 2.
EDIT: I even read a thread on the net where a guy uses plane ole pipe thread sealant and said he never had an issue with oil or coolant working its way past the threads.