Just double check its not coming from the hose.. That caught me out , Ive never normally had a problem and it was simply the hose leaking underneath where I couldn't see it running down.  File both sides flat , clean and use a black gasket paper .060 thick and some non hardening on both sides and around the threads, don't go overboard with tightening. Bob's your auntie!



"Came too close to dying to stop living now!"

That's a good suggestion. Just make sure the recess for the Stat is still sufficient for the Stat to sit below the flat Surface. Sometimes the Housings are just too far gone to still be usable.

  

Whenever I get a leak around the thermostat housing I make sure the sealing surface on the housing is flat by using a flat steel plate and some 220 grit emery paper and rub the housing back and forth until it is flat and true.

  Ron Lane,  Meridian, ID

I have several Sheets of proper Gasket Paper that I cut my own Gaskets from if I don't have One on Hand.

  

Never use silicone with a gasket (corners are OK), silicone should be used in place of a gasket, silicone used with a gasket creates silicone worms that can end up in the oil pump or other places, I had a Mazda that had a valve train noise (lifters would not pump up), ended up pulling the head (my friend not me), it had a silicone worm in the oil galley and blocked it off, lesson learned.

Cliff

I don"t know what you guys are call in "paper" but I've made many including different thicknesses of purchased specific gasket material for water areas using Permatex#2  and never had any problems. Some "paper" is porous and should not be used in water applications. I'm pretty anal on stuff like this and I make the material is for water/pressure applications. Good luck.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

I use RTV with no problems.  A thin coat on both sides of the gasket


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Thanks for the Suggestions. I got it fixed. Used a flat file to lightly knock off any high Spots on the Intake Outlet. Paper Gasket and Permatex Aircraft liquid Sealant on Housing and Intake outlet. Don't see any Leaks now. I will snug up the Bolts again in a Couple of Days. Doesn't take much of a High Spot to cause it to Leak. 

  

My housing was just leaking last month. Last time it was apart 13 years ago both pieces showed corrosion. Before disassembling it ordered a reproduction housing with by pass tube installed, and a replacement tube to install into my old housing as an option.. I decided  to install new reproduction thermostat housing. Its been thru several heat-ups and no problems. I have never use form a gasket or any other silicon type sealer. I always use a LIGHT coat of gasket shellac/sealer on all surfaces and take a paper towel to remove any excess. Let dry for 10 minutes and assemble. Always works for me. 

I have used a thin film of ‘black’ RTV on both sides of the thermostat gaskets that just don’t stop weeping under normal circumstances.

Lorena, Texas (South of Waco)