Just an fyi...the problem with chrome t-stat housings(or valve covers, timing chain covers, etc.) is the chrome itself....it' just too slick to seal. That's why some of them have the o-ring design.The o-ring style does seem to leak less....but they still leak, in most cases. Sealants, or gaskets just won't seal tight against a slick surface, it just slides right out, which is why it's recommended to grind off the chrome on the sealing surfaces. Same issue with the hoses...they won't tighten down very well on a slick surface, especially if there is any coolant, or other liquid(including sealers) on them. Just not a good idea for a driven car. Show cars can get by with the purdy stuff, but it takes a lot of work to use that stuff without problems on a driver. 

interesting.  Thank you for the information.  I understand why now after that explanation.