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Old 12-08-2017, 12:57 PM   #1
boss351290
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Default Boss 5.4 thermostat balance pipe o rings

Hello, can someone please help to find the best place to get the o rings on the thermostat balance pipe that runs water between the two heads on the 5.4 boss motor. Mine is leaking a bit of coolant from the o ring on the drivers side head.

Last edited by boss351290; 12-08-2017 at 12:59 PM. Reason: V
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Old 15-08-2017, 03:09 PM   #2
blackf6
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Default Re: Boss 5.4 thermostat balance pipe o rings

Get them from America. Summit Racing ect. Usually the pipe is stuffed. They have total replacement kits utilising coolant hose in America.
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Old 15-08-2017, 04:55 PM   #3
GTLEGEND
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Default Re: Boss 5.4 thermostat balance pipe o rings

What month/year 5.4 do you have as they are different for the RH bank.

1/7/2002 - 30/9/2005 RH: 3L3Z 8C387 AA, LH: 3L3Z 8C388 AB

1/10/2005 on RH: 3L3Z 8C387 AB, LH: 3L3Z 8C388 AB

I think the only one you can still buy from Ford is the later RH one. 3L3Z 8C387 AB.

The cross pipe has a part number of 3L3Z 8C368 LA.
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