adam g
Full Access Member
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?
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