A exhaust leak has developed on a couple of ports, will replace the gasket and re-torque. Suggestions on the best brand of gasket to use?
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A exhaust leak has developed on a couple of ports, will replace the gasket and re-torque. Suggestions on the best brand of gasket to use?
MK4 #9121 - Complete kit - Stroked 351, T5x, 3.55 Rear End, 3-Link - Pickup 6/17/17, 1st start 12/2/17, Go-Kart 12/9/17, Road Worthy 4/27/18
My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
(Most viewed Roadster build thread on this forum!)
Delivered: 6/17/2017
First Start: 12/30/2017
Completed: 12/7/2019
Legal: 1/30/2020
Member of the Mile-Hi Cobra Club
Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread
Thought copper RTV was good up to 700 degrees F? How do you apply in a header application?
MK4 #9121 - Complete kit - Stroked 351, T5x, 3.55 Rear End, 3-Link - Pickup 6/17/17, 1st start 12/2/17, Go-Kart 12/9/17, Road Worthy 4/27/18
My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
(Most viewed Roadster build thread on this forum!)
Delivered: 6/17/2017
First Start: 12/30/2017
Completed: 12/7/2019
Legal: 1/30/2020
Member of the Mile-Hi Cobra Club
Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread
This is a common problem, and it's because of the shape of the header port. Take a look at this picture. You can see that the shape of the header port doesn't match the shape of the exhaust gasket very well at the bottom. This is the weak spot, and eventually this will fail. Even the gasket supplied with the headers from FFR look like this. Some of the expensive copper gaskets, like Percy, are a little bit longer here and will cover this area a little bit better. But sometimes even these will fail.
As said above, just use some copper RTV and move on. It will last for years without a failure. Even on the race track.
.boB "Iron Man"
NASA Rocky Mountain, TTU #42, HPDE Instructor
BDR 1642: Coyote, 6 Speed Auto, Edelbrock Supercharger
Member: www.MileHiCobraClub.com
www.RacingTheExocet.com
DIRECTIONS:
For best results, clean and dry all surfaces with a residue-free solvent, such as Permatex® Brake & Parts Cleaner.
Cut nozzle to desired bead size – gaskets are best formed using a 1/16" to 1/4" bead.
Apply a continuous and even bead of silicone to one surface, surrounding all bolt holes. Remove excess with knife at once. Assemble parts immediately. Do not squeeze out silicone by over tightening bolts. Re-torque will not be necessary.
Silicone dries in 1 hour, and fully cures in 24 hours, at 70˚F (21˚C) - 50% relative humidity. Allow more time in cold weather.
Replace cap after use. Clean hands with dry cloth or Permatex® Fast Orange® Hand Cleaner. Clean tools with non-flammable cleaning fluid.
My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
(Most viewed Roadster build thread on this forum!)
Delivered: 6/17/2017
First Start: 12/30/2017
Completed: 12/7/2019
Legal: 1/30/2020
Member of the Mile-Hi Cobra Club
Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread
Not a whole lot, about this much. Lit it sit for a it and skim over, and then tighten it down.
I get a pair of 1.5 - 2" long bolts and cut the heads off. I put them in a couple of holes and use them like alignment dowels. Then you can just slide the headers in place without making a big mess.
Get all the bolts started a couple of turns. Then go down the line and tighten each bolt 1-2 turns. If you snug the flange to the head with one bolt, there are a couple of bolts you won't be able to get in. When you get all the bolts finger tight, then you can torque in the proper sequence.
.boB "Iron Man"
NASA Rocky Mountain, TTU #42, HPDE Instructor
BDR 1642: Coyote, 6 Speed Auto, Edelbrock Supercharger
Member: www.MileHiCobraClub.com
www.RacingTheExocet.com
I used the ultra copper instead of gaskets. I also used ARP studs in place of the bolts supplied. Can't offer any feedback as I haven't had engine start yet.
JR
Mk4 complete kit #9059 ordered 1/19/17 delivered 3/23/17, 2015 IRS, Fortes/DART347,TKO 600, hyd clutch, P/S, 12.88 wilwood brakes front and rear, heater/defrost and vintage gauges
First start and go-cart 4/11/18. Taken To Whitby Motorcars Greensboro, N.C. 2/5/21 for body/paint
No particular reason, purely random.
.boB "Iron Man"
NASA Rocky Mountain, TTU #42, HPDE Instructor
BDR 1642: Coyote, 6 Speed Auto, Edelbrock Supercharger
Member: www.MileHiCobraClub.com
www.RacingTheExocet.com