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Best Exhaust Bolt to Head Sealant Opinions Please. #2975692 10/18/21 02:45 PM 10/18/21 02:45 PM
Joined: Jan 2003 Posts: 2,179 Walton, Indiana TimS OP top fuel
TimS OP top fuel Joined: Jan 2003 Posts: 2,179 Walton, Indiana	Getting ready to put my stock exhaust manifolds back on the 71 340 Cuda. I've had issues with leaky threads in the head coolant port areas in the past with other projects. What is the best sealant to use these days to prevent this? Thanks !! 1968 Barracuda Fastback 318-2BBL 904 2.76 Frost Blue Survivor 1970 Roadrunner 440+6 BBL 727 AT 4.10 SG Dana Blue Fire Metallic 1971 Cuda 340-4 BBL 4spd 3.91 SG Curious Yellow 1972 Barracuda 318-2 BBL 904 AT 3.23 1 Legger Tor Red/White Vinyl Top 2007 Dodge Ram 1500 5.7 Hemi AT Patriot Blue 2011 Dodge Challenger RT 5.7 Hemi 6spd 392 SG Triple Black 2014 Dodge Charger RT Max AWD 5.7 Hemi AT 305 Billet Silver

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: TimS] #2975710 10/18/21 03:20 PM 10/18/21 03:20 PM
Joined: Aug 2003 Posts: 43,232 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,232 Bend,OR USA	I like and use Permatex brand Adhesive Silicone for thread sealing, works good too I use to buy and use the G.M brand thread sealer but not anymore after their latest formula change Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: Cab_Burge] #2975723 10/18/21 03:45 PM 10/18/21 03:45 PM
Joined: Jan 2003 Posts: 2,179 Walton, Indiana TimS OP top fuel
TimS OP top fuel Joined: Jan 2003 Posts: 2,179 Walton, Indiana	Originally Posted by Cab_Burge I like and use Permatex brand Adhesive Silicone for thread sealing, works good too I use to buy and use the G.M brand thread sealer but not anymore after their latest formula change The copper hi temp stuff? 1968 Barracuda Fastback 318-2BBL 904 2.76 Frost Blue Survivor 1970 Roadrunner 440+6 BBL 727 AT 4.10 SG Dana Blue Fire Metallic 1971 Cuda 340-4 BBL 4spd 3.91 SG Curious Yellow 1972 Barracuda 318-2 BBL 904 AT 3.23 1 Legger Tor Red/White Vinyl Top 2007 Dodge Ram 1500 5.7 Hemi AT Patriot Blue 2011 Dodge Challenger RT 5.7 Hemi 6spd 392 SG Triple Black 2014 Dodge Charger RT Max AWD 5.7 Hemi AT 305 Billet Silver

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: TimS] #2975734 10/18/21 04:00 PM 10/18/21 04:00 PM
Joined: Aug 2003 Posts: 43,232 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,232 Bend,OR USA	Originally Posted by TimS Originally Posted by Cab_Burge I like and use Permatex brand Adhesive Silicone for thread sealing, works good too I use to buy and use the G.M brand thread sealer but not anymore after their latest formula change The copper hi temp stuff? No, it is not a adhesive type silicone Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: Cab_Burge] #2975739 10/18/21 04:11 PM 10/18/21 04:11 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	i've had good luck lately with the permatex ultra-gray.

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: lewtot184] #2975788 10/18/21 06:02 PM 10/18/21 06:02 PM
Joined: Oct 2010 Posts: 2,408 Ambridge, Pa. R rickraw top fuel
rickraw top fuel R Joined: Oct 2010 Posts: 2,408 Ambridge, Pa.	Teflon tape and Teflon pipe dope, it will never leak.

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: rickraw] #2975852 10/18/21 08:07 PM 10/18/21 08:07 PM
Joined: Dec 2004 Posts: 10,555 Rittman Ohio fourgearsavoy I Live Here
fourgearsavoy I Live Here Joined: Dec 2004 Posts: 10,555 Rittman Ohio	Originally Posted by rickraw Teflon tape and Teflon pipe dope, it will never leak. The Permatex or ARP stuff in a container with a brush. Make sure both parts are as clean as you can possibly get them and brush some Teflon sealer on the threads and you are good to go. Gus 64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: fourgearsavoy] #2975972 10/19/21 06:30 AM 10/19/21 06:30 AM
Joined: Jan 2003 Posts: 2,179 Walton, Indiana TimS OP top fuel
TimS OP top fuel Joined: Jan 2003 Posts: 2,179 Walton, Indiana	Thanks very much for the recommendations. 1968 Barracuda Fastback 318-2BBL 904 2.76 Frost Blue Survivor 1970 Roadrunner 440+6 BBL 727 AT 4.10 SG Dana Blue Fire Metallic 1971 Cuda 340-4 BBL 4spd 3.91 SG Curious Yellow 1972 Barracuda 318-2 BBL 904 AT 3.23 1 Legger Tor Red/White Vinyl Top 2007 Dodge Ram 1500 5.7 Hemi AT Patriot Blue 2011 Dodge Challenger RT 5.7 Hemi 6spd 392 SG Triple Black 2014 Dodge Charger RT Max AWD 5.7 Hemi AT 305 Billet Silver

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: fourgearsavoy] #2975990 10/19/21 08:42 AM 10/19/21 08:42 AM
Joined: Jan 2003 Posts: 13,376 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,376 Marion, South Carolina [><]	Originally Posted by fourgearsavoy [q uote=rickraw]Teflon tape and Teflon pipe dope, it will never leak. The Permatex or ARP stuff in a container with a brush. Make sure both parts are as clean as you can possibly get them and brush some Teflon sealer on the threads and you are good to go. Gus [/quote] CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: TimS] #2976546 10/20/21 03:56 PM 10/20/21 03:56 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	Been using ACE Hardware Pipe joint compound with PTFE which works for me: https://www.acehardware.com/departm...ments/plumbers-putty-and-sealers/4047429 After doing some research, bough some Gasoila Thread Sealant which is supposed to be better and has a higher temperature rating (600 degrees F vs. 500 degrees F): https://www.amazon.com/Gasoila-Soft-Set-Thread-Sealant-Paste/dp/B00CRKWAXQ

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: 451Mopar] #2976732 10/21/21 08:51 AM 10/21/21 08:51 AM
Joined: Nov 2013 Posts: 712 Southern Alberta Uberpube super stock
Uberpube super stock Joined: Nov 2013 Posts: 712 Southern Alberta	Masters metallic pro dope.

Re: Best Exhaust Bolt to Head Sealant Opinions Please. [Re: Uberpube] #2976799 10/21/21 12:32 PM 10/21/21 12:32 PM
Joined: Sep 2003 Posts: 19,492 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,492 north of coder	loctite 567 teflon paste. use it on everything requiring a sealant. been using it for over 40 years.

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