Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: gzig5]
#2824482
09/24/20 10:19 AM
09/24/20 10:19 AM
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Joined: Jun 2004
Posts: 3,380 St. Charles, MO
wingman
Uncreative Title
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Uncreative Title
Joined: Jun 2004
Posts: 3,380
St. Charles, MO
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Remflex are the best I have used--they sealed on cheap headers that I could not get to seal with other gaskets.
1969 Dodge Coronet Super Bee 383 A4 1970 Plymouth Road Runner 440 FC7 (sold)
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: wingman]
#2824572
09/24/20 02:00 PM
09/24/20 02:00 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: TJP]
#2824757
09/24/20 09:34 PM
09/24/20 09:34 PM
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Joined: Jan 2003
Posts: 3,922 Richmond, Indiana
19swinger70
master
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master
Joined: Jan 2003
Posts: 3,922
Richmond, Indiana
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I have had copper header and collector gaskets on my 340 w/ J heads since I put the car back on the road in 2002. No leaks, still working fine. I did not coat them with anything. (I have TTI headers.)
1970 340 swinger. sublime 1967 barracuda fastback BB 55 Plymouth Project
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: 19swinger70]
#2825027
09/25/20 03:33 PM
09/25/20 03:33 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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Regardless of who's gaskets you use, you have to look at the flange-to-head and mate up the gasket... to see IF it'll make physical contact and seal. Some headers, example Hooker 5115 Super comp (SB Mopar), have poor flanges with the factory welded beads not allowing contact with the gasket ports completely around their ports... NOTHING will then seal!... and you'll have to apply extra surface area of welding and or hi-temp JB Weld epoxy around the port so the gasket will have some contact.
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!
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: mopars4ever]
#2825530
09/27/20 06:14 AM
09/27/20 06:14 AM
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Joined: Jan 2003
Posts: 21,645 San Jose,CA
migsBIG
YouTube is my go-to news source
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YouTube is my go-to news source
Joined: Jan 2003
Posts: 21,645
San Jose,CA
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I gotta agree the Remflex will seal for sure. My question for other Remflex users. Have you reused the gasket? My Remflex gasket stuck to the headers when I removed them and they tore apart. My buddy does reuse them. He builds demo derby cars and reuses headers on all the small block chrysler engines he's swapped from car to car. One set of headers has been on 6 cars in 11 derby's so far, I just bought some used TTi's headers and will be running Remflex on those.
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: jlatessa]
#2825863
09/27/20 10:51 PM
09/27/20 10:51 PM
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Joined: Jan 2003
Posts: 8,027 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,027
Tulsa OK
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I have been real happy with the TTI Gaskets. They seal great and due to some transmission issues I have re used my passenger side one about 5 times now from pulling that header and have had zero issues.
68 Barracuda Formula S 340
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: jlatessa]
#2826024
09/28/20 01:14 PM
09/28/20 01:14 PM
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Joined: Sep 2003
Posts: 19,405 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,405
north of coder
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I don't know why there is some resistance to cutting the flanges as you say, RoadrinninMark??
I have posted that solution maybe 10 times over the years, it works just as you say.
Never a leak here.....
Joe same here. i always cut the flanges. plus, drill one bolt hole per flange oversize. this allows the flange to "float" a bit during heating and contracting. no leaks on even the thin, flimsy flanges. i stole this idea from a member here years and years ago, and it just flat out works !
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Re: 340 Header Gasket (copper or aluminum) recomendation
[Re: TJP]
#2827416
10/01/20 02:54 PM
10/01/20 02:54 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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I'm a former aftermarket gasket applications engineer from Fel-Pro... 22+ years from the 70s-90s... with my interest in Mopars, they allowed me to work on many of the Dodge/Ply/Chrysler applications.... it was a great fun time and a great company back then!
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!
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