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09-27-2009, 06:34 AM | #1 |
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New Hedman Headers - Leaking
Finally got the engine & tranny (5 speed) in my '80 EL C ..... this week installed a brand new set of HEDMAN HEADERS (yes they fit) and a "X-Pipe" 2 1/2 exhaust system.
Now that the car is quiet enough to hear what is going on I can hear/see there is a leak between the left side header & head. For the install new gaskets were used along with new headers bolts and all bolts torqued down. Has anyone else had trouble with HEDMAN HEADERS like this???? Any suggestions for a "fix" or will I have to replace the header???
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John aka "Milner" PA-IndianRider - Pittsburgh, PA 70 Chevy C10 Stepside "Gasser/Altered Drag Race Hot Rod" Where were You in '62 ? Last edited by PA-IndianRider; 09-27-2009 at 06:37 AM. |
09-27-2009, 07:33 AM | #2 |
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Re: New Hedman Headers - Leaking
Remove the header, use a level/flat surface and ensure the mounting flange is straight. It not, pound it flat or weld to build it up. or just use more gasket in that area.
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09-27-2009, 09:09 AM | #3 |
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Re: New Hedman Headers - Leaking
Try it again with a new gasket and if that dont work
return the headers, they are brand new and I'm sure you spent enough on them not to have to fiddle with it.
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09-27-2009, 09:17 AM | #4 |
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Re: New Hedman Headers - Leaking
You can toss the gaskets and use the high temp rtv sealer.
Last edited by Alex1; 09-27-2009 at 09:18 AM. |
09-27-2009, 11:17 AM | #5 |
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Re: New Hedman Headers - Leaking
It really does work. I haven't used a header gasket on the Nova in years,, just the orange Permetex hitemp. BUT, those are Lemons headers with a nice thick flat flange and Stal bolt pattern, track only car. I've never tired it on a set of street headers. How does it hold up on the street and or a daily driver Alex?
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09-27-2009, 02:24 PM | #6 | |
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Re: New Hedman Headers - Leaking
Quote:
So I "assume" the Permetex would be used "without" the gasket???
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John aka "Milner" PA-IndianRider - Pittsburgh, PA 70 Chevy C10 Stepside "Gasser/Altered Drag Race Hot Rod" Where were You in '62 ? |
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09-28-2009, 03:28 PM | #7 | |
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Re: New Hedman Headers - Leaking
Quote:
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09-27-2009, 02:39 PM | #8 |
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Re: New Hedman Headers - Leaking
are you using the header gaskets that came with the headers? if so i would change them out to a thicker set of percys or felpros.
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09-27-2009, 08:53 PM | #9 |
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Re: New Hedman Headers - Leaking
I have the same problem with a set of Hedman's on my 454 in the '72. These are their $89 street headers and I have to run 2 gaskets on each side to make it seal. The tube of the primary tube sticks out past the flange a bit and causes them to leak like a *****..........
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09-27-2009, 09:12 PM | #10 |
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Re: New Hedman Headers - Leaking
Did the headers leak right away or after a couple of heat cycles? THe gasket will set and the bolts will loosen up. If there was a couple of heat cycles on the motor you may want to check the bolts again. Typically takes 2 or 3 re-torques to get them to stay tight.
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83 C10 Stepside (SOLD, it was a blast!) 383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt S475 and C4 DM running, fine tuning turbo= Douchebag Racing: Runs Fine all the Time |
09-27-2009, 09:18 PM | #11 | |
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Re: New Hedman Headers - Leaking
Quote:
Will work on it tomorrow....
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John aka "Milner" PA-IndianRider - Pittsburgh, PA 70 Chevy C10 Stepside "Gasser/Altered Drag Race Hot Rod" Where were You in '62 ? |
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09-28-2009, 08:29 PM | #12 |
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Re: New Hedman Headers - Leaking
I have had three sets of hedman headers on my truck and never had an issue. They were the cheaper ones to.
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83 C10 Stepside (SOLD, it was a blast!) 383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt S475 and C4 DM running, fine tuning turbo= Douchebag Racing: Runs Fine all the Time |
09-28-2009, 09:52 PM | #13 |
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Re: New Hedman Headers - Leaking
If all else fails cut the flanges on either side of the two center primarys. I have seen this done on small blocks. I assume it lets them flex a little.
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09-28-2009, 11:45 PM | #14 |
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Re: New Hedman Headers - Leaking
as stated earlier the crap paper gaskets that come with headers will leak. get a set of fel pro header gaskets and you wont have any more issues
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09-29-2009, 08:29 PM | #15 | |
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Re: New Hedman Headers - Leaking
Quote:
I also retorqued them after a few heat cylces and I have a good flat head surface that they bolt to.
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83 C10 Stepside (SOLD, it was a blast!) 383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt S475 and C4 DM running, fine tuning turbo= Douchebag Racing: Runs Fine all the Time |
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