TheGeorgiaKid Posted November 25, 2007 Report Share Posted November 25, 2007 (edited) I just put my Dynatech header kit on yesterday. What a job! Sounds great even on the stock exhaust system. The only problem is that flange is leaking on the number 5 cyl all the others are fine. I wasn't to impressed with the straightness of the flanges to start with (even though they are not off much), but I figured it would straighten after it got hot & I retorqued the bolts & it would stop, but it didn't. I'm going to try a set of Fel Pro header gaskets & see if it stops. Anyone else having a problem? Edited November 25, 2007 by TheGeorgiaKid (see edit history) Quote Link to comment Share on other sites More sharing options...
WRO44 Posted November 25, 2007 Report Share Posted November 25, 2007 What gasket did you end up going with?? That could be part of your problem Quote Link to comment Share on other sites More sharing options...
TheGeorgiaKid Posted November 25, 2007 Author Report Share Posted November 25, 2007 (edited) What gasket did you end up going with?? That could be part of your problem I used the gaskets that came with the headers. They are OEM style gaskets. How was the straightness of the header flanges on yours? Edited November 25, 2007 by TheGeorgiaKid (see edit history) Quote Link to comment Share on other sites More sharing options...
smoke03 Posted November 25, 2007 Report Share Posted November 25, 2007 alot of people say that you need to go to your dealership and get the gm gaskets... Quote Link to comment Share on other sites More sharing options...
WRO44 Posted November 26, 2007 Report Share Posted November 26, 2007 I used the gaskets that came with the headers. They are OEM style gaskets. How was the straightness of the header flanges on yours? I actually haven't installed mine yet...they are on the garage floor, but I am definately going with the gaskets from the dealer. Thats what all these guys recommend so I figure they all can't be wrong! Actually ur the 1st I have heard that their Dynatechs leak on... Quote Link to comment Share on other sites More sharing options...
TheGeorgiaKid Posted November 26, 2007 Author Report Share Posted November 26, 2007 I personally say to heck with the OEM style or GM gaskets for headers. They are made for manifolds that are machined true & won't flex/warp. I'm going to swap them out for a set of #1438 Fel Pro Header gaskets & see if that fixes them. Quote Link to comment Share on other sites More sharing options...
rivierakid55 Posted November 26, 2007 Report Share Posted November 26, 2007 for what its worth i had the flanges machined on mine even brand new. ive installed too many other brands of headers that leaked so it was worth the small expense to ensure no leaking. Quote Link to comment Share on other sites More sharing options...
detjoe Posted November 26, 2007 Report Share Posted November 26, 2007 you could try to get a belt sander and true the flange. Quote Link to comment Share on other sites More sharing options...
TheGeorgiaKid Posted November 27, 2007 Author Report Share Posted November 27, 2007 I talked to Dynatech & they are going to replace the drivers side header that is leaking. It was a .020 gap at the top of the flange on #5 cyl. The other header is fine. So the OEM type gaskets should be ok, but I think I'm still going to use the Fel Pro header gaskets. Quote Link to comment Share on other sites More sharing options...
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