On 3 Mustang Cobra Mach 1 4v Head Cooling Mod 1999 Coolant Upgrade Dohc Mach1 on 2040-parts.com

On 3 Performance

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Without the head cooling mod, there isn’t a cooling passage in the back of the head and believe to cause engine failure.  This will allow the coolant to just pass though the head and flow out of the back freeze plug port and directly back to the radiator.

We also have people question the 90 degree elbow talking about possible failure.  Its not standard plastic, the material is Delrin and actually a machined out piece.  If your not fimiliar this material is used in many industries, it has high strength, resistance to many chemicals including gasoline and resistant to continuous impact.  Ideally this was a good matieral choice and fit better than the brass hose fittings on the market.

This will not work on the 96-98 4v motors, they have the IMRC plates that interfere.  I do believe its possible if you have these deleted, you could run this if you have access to the freeze plug and hole for the hold down tab.

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Here are a few installed photos to show you how it works and how to install yours.  The freeze plug in the back of the driverside head will need to be knocked out.  Then you can install the main billet machined body that will allow you to port into the back of the head

Once you have that fitting installed into the head and the short hose and delrin elbow, you just run the line around that taps into the front radiator hose.  As you can see the install is very straight forward, very functional and a must on your 99+ 4v motor