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Thread: 6.9 block heater?

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    Full Access Member adam g's Avatar
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    Default 6.9 block heater?


    Where is a safe place to put a block heater on a 6.9? I heard that freeze plug style htrs can crack the block. Any recommendations?

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    blowing chunks Knuckledragger's Avatar
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    The stock ones are in the freeze plug hole, can't do much better than that. And no, they don't crack the block. That is what happens if you do not use coolant or a heater and let the truck freeze overnight.
    1985 F250 6.9 Single cab N/A, C6

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    Full Access Member jhnlennon's Avatar
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    83-early 85 engines had issues with the block cracking around the block heater. Well documented. Alot of people run a circulating tank type heater, there might be a lower radiator hose heater available to.
    1995 Dodge 3500 Ex Cab DRW 4x4 5.9 CUMMINS Auto, completely stock for now

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    jhnlenon has the correct answer. Somewhere on here there probably is the info on the serial # breaking point where IH fixed this casting defect. It's probably safe to say if the engine was built in late 1985 or later you can just use the stocker. Mine is an 86 and has a Dec 85 build date. I use the block heater with no issues
    Truck: 1986 F-250 6.9L ATS Non gated turbo, 3.55s, T-18(that's right the C6 is gone)

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    Is getting worn out dyoung14's Avatar
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    Yes if its a 83 84 and some 85 blocks un plug the block heater and throw the plug away cause it can cause your block to crack, the later blocks didnt have the prblem
    ~David~

    "THE TOY" 1986 Ford F-250xlt lariat 4x4 t-19, 89 model dash and gauges powered by an 83 model 6.9 engine bored .020 with all gaskets copper coated, turbocharged, wasetgate unplugged,7.3 turbo pump maxxed, turbo injectors, 7.3 rockers, ram-air intake, max boost is more than anyone else. will turn the whole road black if i want it too

    Who says idi's cant make high boost?

    1995 F-350 DRW 2wd ZF5 ext. cab, 7.3 powerstroker, 6637 intake, choped exhuast

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    Is getting worn out dyoung14's Avatar
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    Quote Originally Posted by Diesel JD View Post
    jhnlenon has the correct answer. Somewhere on here there probably is the info on the serial # breaking point where IH fixed this casting defect. It's probably safe to say if the engine was built in late 1985 or later you can just use the stocker. Mine is an 86 and has a Dec 85 build date. I use the block heater with no issues
    posted at the same time
    ~David~

    "THE TOY" 1986 Ford F-250xlt lariat 4x4 t-19, 89 model dash and gauges powered by an 83 model 6.9 engine bored .020 with all gaskets copper coated, turbocharged, wasetgate unplugged,7.3 turbo pump maxxed, turbo injectors, 7.3 rockers, ram-air intake, max boost is more than anyone else. will turn the whole road black if i want it too

    Who says idi's cant make high boost?

    1995 F-350 DRW 2wd ZF5 ext. cab, 7.3 powerstroker, 6637 intake, choped exhuast

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    Full Access Member adam g's Avatar
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    It was in an early 84 truck and I plan on using a lower hose heater. Thanks guys.

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