Goofy question
Cargo Master
Joined: Jun 2010
Posts: 2,113
Likes: 4
From: Iowa
Generally block heaters have a gasket or an O-ring and don't require thread sealant? It probably won't hurt anything but that's just my experience.
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Joined: Oct 2008
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From: Bucyrus, KS
Yea there's no need to teflon the threads. I installed a block heater in my 2013. It has a think O-ring so you just thread it in and tighten it down. Just make sure your ready like quick draw Mcgraw when you pull the block plug out. It'll make huge mess unless your quick.
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Joined: Oct 2015
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Yep, you guys were correct as usual. I hadn't actually looked at it until I started to install it today, there was an O ring. Thanks again for all the great info!! 
Of course I installed the Engine Block Heater and the Wolverine Oil Pan Heater and it was in the 70s today. I had to take a lunch break with the wife and ride the Honda Valkyrie to lunch. It sure felt good to get a ride in with the 1800.
It also felt good to get both heaters installed and ready for the next cold snap, whether that's in a week or two, or next winter.
Of course I installed the Engine Block Heater and the Wolverine Oil Pan Heater and it was in the 70s today. I had to take a lunch break with the wife and ride the Honda Valkyrie to lunch. It sure felt good to get a ride in with the 1800.
It also felt good to get both heaters installed and ready for the next cold snap, whether that's in a week or two, or next winter.
Hotshot
Joined: Apr 2013
Posts: 10,118
Likes: 650
From: NH
Huh - I was under the impression all 6.7L's came with a block heater built in, some needed to purchase just the cord?
For me in a cold weather state, block heater and supplemental heater were freebies...
For me in a cold weather state, block heater and supplemental heater were freebies...
Hotshot
Joined: Apr 2013
Posts: 10,118
Likes: 650
From: NH
There goes my theory. It seems unfair to "give" some freebies to those in cold weather states, but not to those everywhere else.
Here are the Ford-designated "cold weather states:"
AK, CO, IA, ID, ME, MI, MN, MT, ND, NH, NY, SD, VT, WI, WY
On the "build and price" pages from Ford, the block heater is listed as no charge for the above list of states. Interestingly, the $250 optional rapid supplemental heater is not listed as standard in cold weather states, but my window sticker shows "no charge" for it (bought in Vermont).
Well, good luck with installing yours.