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header gaskets ? #2687548 08/14/19 08:37 AM 08/14/19 08:37 AM
Joined: May 2007 Posts: 279 Chicago land, IL dafixr OP enthusiast
dafixr OP enthusiast Joined: May 2007 Posts: 279 Chicago land, IL	What is the best header gasket to use. Street use Have copper now but leaks even with high temp silicone. Headers are cut in between to float Thanks

Re: header gaskets ? [Re: dafixr] #2687557 08/14/19 08:53 AM 08/14/19 08:53 AM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	Originally Posted by dafixr What is the best header gasket to use. Street use Have copper now but leaks even with high temp silicone. Headers are cut in between to float Thanks Remflex. They'll seal almost anything. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Re: header gaskets ? [Re: dafixr] #2687559 08/14/19 08:53 AM 08/14/19 08:53 AM
Joined: Jan 2003 Posts: 13,567 md M mopars4ever I Live Here
mopars4ever I Live Here M Joined: Jan 2003 Posts: 13,567 md	Remflex gaskets works for me. My only problem with them is they can tear when removing them after use.

Re: header gaskets ? [Re: mopars4ever] #2687645 08/14/19 11:36 AM 08/14/19 11:36 AM
Joined: May 2007 Posts: 279 Chicago land, IL dafixr OP enthusiast
dafixr OP enthusiast Joined: May 2007 Posts: 279 Chicago land, IL	Can we get from Jegs or Summit? Thanks Last edited by dafixr; 08/14/19 11:37 AM.

Re: header gaskets ? [Re: dafixr] #2687650 08/14/19 11:54 AM 08/14/19 11:54 AM
Joined: Jun 2018 Posts: 350 Mequon, WI G gzig5 enthusiast
gzig5 enthusiast G Joined: Jun 2018 Posts: 350 Mequon, WI	Originally Posted by dafixr Can we get from Jegs or Summit? Thanks You have a computer. You can go on their sites and see if they carry them for your application or call them. Come on man!

Re: header gaskets ? [Re: dafixr] #2687660 08/14/19 12:12 PM 08/14/19 12:12 PM
Joined: Aug 2003 Posts: 43,097 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,097 Bend,OR USA	Sounds like you need to have the header flanges machine flat to seal them up better Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: header gaskets ? [Re: Cab_Burge] #2687662 08/14/19 12:15 PM 08/14/19 12:15 PM
Joined: Mar 2007 Posts: 3,277 West Coast, USA jbc426 master
jbc426 master Joined: Mar 2007 Posts: 3,277 West Coast, USA	I've used a body board and 80 grit to knock down the high spots on the flanges before, if its an issue. As mentioned above, Remflex is the only way to go. 1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)

Re: header gaskets ? [Re: jbc426] #2687706 08/14/19 01:30 PM 08/14/19 01:30 PM
Joined: Jun 2006 Posts: 5,159 CT GTX MATT master
GTX MATT master Joined: Jun 2006 Posts: 5,159 CT	Percy's dead soft aluminum has worked great for me Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: header gaskets ? [Re: madscientist] #2687715 08/14/19 01:48 PM 08/14/19 01:48 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	Originally Posted by madscientist Originally Posted by dafixr What is the best header gasket to use. Street use Have copper now but leaks even with high temp silicone. Headers are cut in between to float Thanks Remflex. They'll seal almost anything.

Re: header gaskets ? [Re: 451Mopar] #2687731 08/14/19 03:16 PM 08/14/19 03:16 PM
Joined: Jan 2010 Posts: 1,442 NW Chicago suburban area Mopar Mitch pro stock
Mopar Mitch pro stock Joined: Jan 2010 Posts: 1,442 NW Chicago suburban area	Regardless what gasket you use, IF the two mating surfaces are not clean and flat, or else if the threadings are not clean and free of debris, then no gasket will seal properly. Occasional retorquing is advisable due to the weakness and vibrations of tubular headers. Always inspect the surface flanges of the headers -- they are notorious to have flaws and poor surface flatness (at the welds of the tubes into the flange). Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!

Re: header gaskets ? [Re: Mopar Mitch] #2687740 08/14/19 04:01 PM 08/14/19 04:01 PM
Joined: Jan 2003 Posts: 20,460 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,460 Eagle, Idaho	Copper gaskets and copper rtv should cover it unless your sealing surfaces are uneven. I ink up the flanges and file them in an x-pattern with a wide file until the ink is gone. Last edited by Neil; 08/14/19 06:55 PM.

Re: header gaskets ? [Re: Neil] #2687749 08/14/19 05:14 PM 08/14/19 05:14 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	How thick are the flanges... if 1/4" you could have problems all along... 5/16 can be iffy if not flat.. I build all my headers with 3/8 flanges and still make sure they are flat after welding

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