Preventive Head gasket change
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Three Wheeling
Joined: Jul 2018
Posts: 85
Likes: 3
From: Las Vegas, Nevada
You don't use any sealant with cometic head gaskets.
You *do* want to have your heads milled perfectly flat. Thickness of hg depends on how much metal got milled off your heads. Typically you will want the thinnest HGs that Cometic will ship.
ARP studs are a natural fit for metal head gaskets. Because metal HGs seal so well, you don't have to use as much torque when bolting your heads back on. I used 81 ftpds. Others use 70. Using a sealant would interfere with this process.
Also, using ARP studs with their supplied precision-grease will mean that your torque measurements are more accurate than what anyone else can get using the other type of bolts that stretch.
It's just a superior all-around combination. Obviously it costs more to gain a better seal, use material that doesn't tear as easily as rubber, and obtain precise torque.
Highly recommended mod.
You *do* want to have your heads milled perfectly flat. Thickness of hg depends on how much metal got milled off your heads. Typically you will want the thinnest HGs that Cometic will ship.
ARP studs are a natural fit for metal head gaskets. Because metal HGs seal so well, you don't have to use as much torque when bolting your heads back on. I used 81 ftpds. Others use 70. Using a sealant would interfere with this process.
Also, using ARP studs with their supplied precision-grease will mean that your torque measurements are more accurate than what anyone else can get using the other type of bolts that stretch.
It's just a superior all-around combination. Obviously it costs more to gain a better seal, use material that doesn't tear as easily as rubber, and obtain precise torque.
Highly recommended mod.
Recovery Vehicle
Joined: Jun 2017
Posts: 1,238
Likes: 240
From: Alabama + Vegas + Texas
Obviously the biggest performance improvements that us laymen can reasonably make to Disco 2s would be:
Performance cam,
Grinding exhaust headers to match head exhaust ports, and
new racing cats.
Likewise, I'd *think* that the biggest maintenance-reducers would be:
inline coolant thermostat mod
metal head gaskets + ARP head studs
Option B
a robust aftermarket, greasable front drive shaft
Last edited by No Doubt; Aug 5, 2018 at 03:41 PM.
Thread Starter
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Three Wheeling
Joined: Jul 2018
Posts: 85
Likes: 3
From: Las Vegas, Nevada
Well I was thinking of using the coatings to reduce temperatures perhaps. I heard a white coating reflects heat back into the combustion chamber to help with a better burn and lower head temps because of the heat reflected back.
The issue with TTY bolts is getting them torqued properly & having good threads. You do it in steps 15FTLB, then let it sit say 20min, then do your first 90 turn, wait another 20-30min, then your final turn and with the proper torque pattern you should be good go.
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Three Wheeling
Joined: Jul 2018
Posts: 85
Likes: 3
From: Las Vegas, Nevada
I am a very economical driver. I rely on fuel deceleration cut off, coasting to lights and I drive with minimal load as far as the right foot goes. I wouldn't be surprised if I got 20 mpg city. I fill my tires 1 pound below maximum rating 2 psi below in summer and I use mobil 1 synthetic too.
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