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Thread: Flange gaskets - use them, or RTV?

  1. #1
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    Flange gaskets - use them, or RTV?

    Did the SW longtube headers last year. The pal helping me with the job was pretty insistent that he's always just used form-a-gasket or RTV instead of actual gaskets on the flange by the H-pipe. I begrudgingly went along with him; now I've got a small leak there. SOOOOOOOOOOOO I bought some gaskets that I'll have to install, which is what I wanted in the first place.

    Just wondering if anyone else has ever gotten away with the copper RTV only in this area? Looking back, it seems real stupid...
    '91 Country Squire | '03 Marauder | '04 CVLX | '10 P7B
    former Panthers: '02 MGM, '04 MGM, '04 MGM v2.0, '04 MM, '07 P71 w/5-speed, '03 SAP P71
    CLICK HERE and have your Marauder's COA info added to the database!!! | 2003 list ||| 2004 list

  2. #2
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    Flange gaskets - use them, or RTV?

    Use factory gaskets. Nothing else...


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  3. #3
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    I have learned over the years that the H pipe gasket is identical to a grand marquis even though at most stores their computer says differently. Also most times not stocked and like $9.00 instead of $4.00 like the Marquis..?

    Anyways, I’ve used the Marquis one at Advance at least twice over the years and never had a fitment or quality issue.


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  4. #4
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    I just use 2-bolt, 2.5" gaskets from Amazon. I've reused them too and no leaks. But OEM is prob the best.
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1SC
    2003 300A Procharger #0017 D1SC (SOLD)

  5. #5
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    Quote Originally Posted by justbob View Post
    I have learned over the years that the H pipe gasket is identical to a grand marquis even though at most stores their computer says differently. Also most times not stocked and like $9.00 instead of $4.00 like the Marquis..?

    Anyways, I’ve used the Marquis one at Advance at least twice over the years and never had a fitment or quality issue.


    Sent from my iPhone using Tapatalk Pro
    Yep, this was actually something Comin in Hot taught me like a decade ago when we put secondary cat delete pipes on my red car.

    Adam your first mistake was taking tech advice from modern day CVN lol


    2016 Ford Mustang GT PP - Lund nGauge, BMR vertical links

    2004 Mercury Marauder - Eaton M112, Billetflow 3.4, Accufab SBTB + Plenum, T-56 Magnum, 4.10s, Stainless Works LTs, 2.5" Exhaust, Borla Stingers, Ridetech Coilovers + Adj rear shocks, FX-R projectors, Wilwood 13" BNSL6 + FNSL4 BBKs, S55 Gauge Cluster
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  6. #6
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    Quote Originally Posted by blazen71 View Post
    I just use 2-bolt, 2.5" gaskets from Amazon. I've reused them too and no leaks. But OEM is prob the best.
    This is what I did as well. No leaks.

  7. #7
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    Quote Originally Posted by offroadkarter View Post
    Adam your first mistake was taking tech advice from modern day CVN lol
    The guy wasn't a CVN guy.
    '91 Country Squire | '03 Marauder | '04 CVLX | '10 P7B
    former Panthers: '02 MGM, '04 MGM, '04 MGM v2.0, '04 MM, '07 P71 w/5-speed, '03 SAP P71
    CLICK HERE and have your Marauder's COA info added to the database!!! | 2003 list ||| 2004 list

  8. #8
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    Okay, so they showed up. What's the common wisdom on install? Use a thin bead of RTV to help them stay in place while mounting, or just mount 'em dry?
    '91 Country Squire | '03 Marauder | '04 CVLX | '10 P7B
    former Panthers: '02 MGM, '04 MGM, '04 MGM v2.0, '04 MM, '07 P71 w/5-speed, '03 SAP P71
    CLICK HERE and have your Marauder's COA info added to the database!!! | 2003 list ||| 2004 list

  9. #9
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    Flange gaskets - use them, or RTV?

    Dry dock it homie.


    Sent from my iPhone using Tapatalk Pro


    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  10. #10
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    Quote Originally Posted by justbob View Post
    Dry dock it homie.


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    Sadist .......

  11. #11
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    Quote Originally Posted by Mr. Man View Post
    Sadist .......
    sa·dist
    /ˈsādist/
    Learn to pronounce
    noun
    noun: sadist; plural noun: sadists
    a person who derives pleasure, especially sexual gratification, from inflicting pain or humiliation on others.
    "he was dubbed a dangerous sexual sadist by the judge at his trial"

    Not much into pain, mostly, well depends really. And the older I get I prefer to be overpowered, humiliated, and dominated.


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  12. #12
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    Quote Originally Posted by justbob View Post
    sa·dist
    /ˈsādist/
    Learn to pronounce
    noun
    noun: sadist; plural noun: sadists
    a person who derives pleasure, especially sexual gratification, from inflicting pain or humiliation on others.
    "he was dubbed a dangerous sexual sadist by the judge at his trial"

    Not much into pain, mostly, well depends really. And the older I get I prefer to be overpowered, humiliated, and dominated.


    Sent from my iPhone using Tapatalk Pro
    To funny

  13. #13
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    Quote Originally Posted by offroadkarter View Post
    Adam your first mistake was taking tech advice from modern day CVN lol
    i LOL’d ............
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