zeitgeist57 Posted March 15, 2012 Report Share Posted March 15, 2012 Guys, for my FOrd 4.9L six (300ci)...do these ball-type exhaust flanges need any sort of gasket, or do they cinch right down on the rounded exhaust manifold? Could I use hi-temp RTV sealant to ensure a seal? Thanks! http://www.columbusracing.com/forums/picture.php?albumid=669&pictureid=5918 Quote Link to comment Share on other sites More sharing options...
Steve R. Posted March 15, 2012 Report Share Posted March 15, 2012 Guys, for my FOrd 4.9L six (300ci)...do these ball-type exhaust flanges need any sort of gasket, or do they cinch right down on the rounded exhaust manifold? Could I use hi-temp RTV sealant to ensure a seal? Thanks! http://www.columbusracing.com/forums/picture.php?albumid=669&pictureid=5918 Those ball and cup flanges don't need a gasket or sealer. Make sure that you have the whole exhaust lined up before you tighten it down. Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted March 15, 2012 Author Report Share Posted March 15, 2012 Thanks for the fast response, Steve! Quote Link to comment Share on other sites More sharing options...
AJ Posted March 15, 2012 Report Share Posted March 15, 2012 Use clear silicone if you want extra protection. Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted March 15, 2012 Author Report Share Posted March 15, 2012 Use clear silicone if you want extra protection. Clear silicone won't burn off? I was thinking of smearing on a band of RTV and letting it sit to tack a bit before bolting it on... Quote Link to comment Share on other sites More sharing options...
gbracing81 Posted March 15, 2012 Report Share Posted March 15, 2012 http://www.permatex.com/products/Automotive/adhesives_sealants/sealants/auto_Permatex_Clear_RTV_Silicone_Adhesive_Sealant.htm I personally wouldn't use any sealer at all, however if you feel you need to use some I would recommend this instead: http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_makers/auto_Permatex_Ultra_Copper_Maximum_Temperature_RTV_Silicone_Gasket_Maker.htm Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted March 15, 2012 Author Report Share Posted March 15, 2012 Thanks, guys! I'll just leave it dry for now. Quote Link to comment Share on other sites More sharing options...
AJ Posted March 16, 2012 Report Share Posted March 16, 2012 clear doesn't burn off. i have no idea why but it holds up better then the high temp stuff. Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted March 16, 2012 Report Share Posted March 16, 2012 That sure is a Purdy engine block! Quote Link to comment Share on other sites More sharing options...
Browning Posted March 19, 2012 Report Share Posted March 19, 2012 doesn't it need a donut gasket for that? Also, if he used sealant, wouldn't that be sort of a waste since that that type of connection is made to flex a bit? Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted March 19, 2012 Report Share Posted March 19, 2012 No, ball type flanges do not use gaskets. Just metal on metal. And they are made to move a tiny bit. Sealant won't "hurt" it. It's only to help seal the Metal to metal. Quote Link to comment Share on other sites More sharing options...
Browning Posted March 19, 2012 Report Share Posted March 19, 2012 ah thanks I did not know that. Kinda funny since my s10 had that same sort of setup and I used donuts on them lol Quote Link to comment Share on other sites More sharing options...
DavidBaustert Posted March 19, 2012 Report Share Posted March 19, 2012 I thought they used lead/graphite type gaskets? Like these: http://img.directindustry.com/images_di/photo-m2/exhaust-gasket-661359.jpg Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted March 19, 2012 Report Share Posted March 19, 2012 That's a completely different flange set up. Quote Link to comment Share on other sites More sharing options...
Clifford Automotive Posted March 21, 2012 Report Share Posted March 21, 2012 My IROC had identical flanges, and they use gaskets. Quote Link to comment Share on other sites More sharing options...
DOZZER Posted March 21, 2012 Report Share Posted March 21, 2012 Fords do not use gaskets on the ball sockets that engine. Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted March 21, 2012 Author Report Share Posted March 21, 2012 My IROC had identical flanges, and they use gaskets. My Corvette had flanges similar to the pic above, and used a donut gasket. It was still a shitty seal. In addition, the stock cast-iron manifold for my carb'd I6 had a flat flange, with a groove that accepted the donut gasket. These EFI manifolds look like they will seal just fine, provided the pipes aren't bent at the mating surface! Quote Link to comment Share on other sites More sharing options...
Clifford Automotive Posted March 23, 2012 Report Share Posted March 23, 2012 My Corvette had flanges similar to the pic above, and used a donut gasket. It was still a shitty seal. In addition, the stock cast-iron manifold for my carb'd I6 had a flat flange, with a groove that accepted the donut gasket. These EFI manifolds look like they will seal just fine, provided the pipes aren't bent at the mating surface! Yeah, the IROC has MAC headers and full exhaust on it, and thats exactly how they are. The flange is welded on not a pressed flange. So the pipe and the flange have a gap where the donut sits. And now that I look at that picture again... No gasket required. Quote Link to comment Share on other sites More sharing options...
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