6.9 heads
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Freshman User
Joined: Sep 2017
Posts: 32
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From: Ward County, ND
6.9 heads
i got a 1986 f250 6.9l and Im trying to find better heads for the motor or some how make the heads stronger. Do you know where to find preformace heads for a 6.9? 
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
The stock heads are plenty strong, 87 6.9 heads were the best because they use the same valve train as a 7.3, 83 used a different precup other than that they are all the same and plenty strong.
If your blowing head gaskets then you need head studs
If your blowing head gaskets then you need head studs
Cargo Master
Joined: Oct 2005
Posts: 2,303
Likes: 29
From: NJ
I'm not aware of any head breakage epidemic. Precups crack from heat, but cracks are OK to run so long as they're not past the fire ring.The only difference from 6.9 to 7.3 heads is the head bolt hole size, and possibly length of the lower head bolt bosses. 7.3 heads had plugs in some coolant passages, some people drill them or remove the plugs entirely. Not sure what the advantage of one way or the other is.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
Likes: 224
From: Nevada
I saved this link a while back, they make new Cylinder Heads if you want to go that route. Probably a bit pricy.
They use to have 6.9/7.3 heads listed.
New and Remanufactured Diesel Cylinder Heads, Blocks, Rods and Castings
Charlie
They use to have 6.9/7.3 heads listed.
New and Remanufactured Diesel Cylinder Heads, Blocks, Rods and Castings
Charlie
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
I saved this link a while back, they make new Cylinder Heads if you want to go that route. Probably a bit pricy.
They use to have 6.9/7.3 heads listed.
New and Remanufactured Diesel Cylinder Heads, Blocks, Rods and Castings
Charlie
They use to have 6.9/7.3 heads listed.
New and Remanufactured Diesel Cylinder Heads, Blocks, Rods and Castings
Charlie
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