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JohnM Jul 29th, 02, 11:33 PM Have some pitted surface problems on the manifold side of the thermostat. Thinking about removing the thermostat, cleaning the surface good and trying some JB Weld to fill the pitted portion, then new gasket, sealer and try it. What do you think? Thanks, John a36chevy Jul 29th, 02, 11:54 PM Get some teflon paste GM part #12346004.GM calls it pipe sealant with PTFE. We use it at the dealer ship I work at to seal all pitted water passages. JJ'65 Jul 30th, 02, 12:48 AM I had some corrosion pitting on the gasket surface of the aluminum thermostat housing on my '65 327. I just cleaned it up good and used a normal amount of good old Permatex #2 on either side when reassembling. No leakage. My $0.02 Midnight Marauder Jul 30th, 02, 2:09 PM Or just buy a good ol cast housing and be done with it. The aluminum and chrome ones always pit and eventually will do it again. BTDT, bought a cast, painted it manifold color, never had an issue again ------------------ '70 SS 396 4spd, 4.10's and a smile TC# 1341 ACES# 05388 Beaux The SS (http://www.chevelles.com/showroom/btmyss.JPG) The Rat (http://www.chevelles.com/showroom/btmill.JPG)- Plans for a 496 in the works. Interior (http://www.chevelles.com/showroom/midint.JPG) Life is a gateway drug that leads to Chevelle addiction. JohnM Jul 30th, 02, 6:26 PM Thanks for the help. I do have a cast 327 manifold, it leaked on the 1st try. Re-sealed it and it was ok. Think I will try the GM paste. Always looking for something better. HOTRODSRJ Jul 30th, 02, 8:46 PM If your aluminum parts are pitting, they are being displaced by electrolysis from the battery being set up in your radiator/coolant/dissimilar metals. Use Zinc or Magnesium sacrificial anodes to counter this plus flush the radiator (probably acidic) and refill with appropriate coolant. Just a suggestion. ------------------ Steve Jack -Concept One Pulleys and Brackets -Engineering & Marketing Technologies -Northern/Southern Rodder Magazine's "Jack'Stands" technical column author/originator | ||