I know it has been talked about before . . . just thought I would give a shout out to "Terry's Auto "Lab" for his no leak t-stat housing !!!

For myself, no matter a big block or small block, I have always had some sort of seepage or leakage from the factory t-stat housing . . . his unit takes all the guess work and silicone sealant, etc out of the installation ! Sure it is a bit pricey, but not having a streak from the t-stat housing on a nice clean painted engine, is way worth it !!

One note, insure you have a "smaller diameter" 80's up thermostat !! For me, it certainly is worth the expense !!!

http://www.terrysautolab.com/

Mark