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#1
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Silicone sealer for header Flange to head question?
Hey Everyone,
When sealing a header flange to a head which is better Permatex RTV red high-temperature Silicone sealant or Permatex Ultra copper high-temperature Silicone sealant? Thanks, Craig |
#2
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I use the copper one. Seems to withstand the heat longer.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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I also wonder about the Permatex red RTV that is the Right-Stuff or Ultra-Red that's both have temperature rating up to 650?
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#4
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i have used a few different types i am a big fan of dow 737 it is the best sealant i have used for almost any application including headers. High or low temp doesnt not seem to matter for header usage. IE copper doesnt matter in my experience.
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#5
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I've always used Ultra Gray. Several years with no issues. If nothing else, it's not as noticeable with aluminum heads and silver headers.
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'68 Firebird 463/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radials/1.37 60'/6.30@108.80/9.93@135.14 Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 2022 - 10.13 @ 133.07 9.93 run - https://youtu.be/hII0_UlYM4U |
#6
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In my experience. Keeping the bolts from backing off is the most important thing. Many companies make kits with clips and washers. The easiest for me was safety wire. I've never had a leak if the bolts were tight.
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#7
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Over the years of using copper gaskets with sealers and after trying many options of combinations of gaskets - My old machinist planed flat the flange and then I used the ultra copper without gaskets. - mufflers on the street and open headers at the track.
They are leaking now - do using mufflers and the resultant backpressure indicate a more comprehensive approach - like special gaskets, etc? Thanks, Craig |
#8
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I always use ultra copper w turbo applications these get crazy hot and have lots of back pressure and it works , regukar headers I’ve never had it fail
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
#9
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Quote:
I use a 4 foot long belt sander to get mine perfect.
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
#10
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If you are running EFI or a stand alone sensor, Make sure what ever you decide to use, that it says its safe for 02 sensors.
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#11
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Had better Luck just going with Remflex gaskets than multiple tries to seal with sealant a warped header flange. Do have to be gentle with them during install though.
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1984 RX7 Jim Hand style 455 /200 4R Project car 67 White/Gold GTO 4 speed sold, 1968 GTO 4 speed sold, 1969 GTO auto sold, 68 Firebird 400 4 speed (455) sold, 65 GTO Night Watch Blue 4 speed sold, 64 GTO Nocturne Blue 4 speed sold, 71 GTO Gold auto sold. 1975 Formula 400 auto sold. Hopefully to be restored, H-"O" Racing 73 Trans Am SD 4 speed, Sons 70 Formula 400 auto, and wife's 1974 AMX 360 auto, 1975 Jeep Honcho 4x4, 1965 Buick Special post |
#12
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I use red or orange.
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#13
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I've used ultra copper without gaskets.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
The Following User Says Thank You to RAIV-Z For This Useful Post: | ||
#14
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I use ultra copper w wide band O2 all the time never had an issue. . Same O2 sensor in my car since 2009
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
#15
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Thanks Guys - I will try this:
Permatex 27038 Optimum Red High Temperature Gasket Maker, 3 oz |
#16
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The Copper is good Too!
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