Well, I posted this truck's update in my 1500 thread before I even cracked a beer open. Not sure what I can blame for that senior moment. Here it is:
Today I finally got off my ass and fixed the heater hose. I started by "measuring" the orifice size. I was able to squeeze a 9/32" drill bit through, thought it felt kinda funny that I could do that. A closer look revealed that the restrictor inside was a chunk of rubber.
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With that said I think I'll engineer my own restrictor next time I'm faced with this. As for the hose?
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I gotta say, it fits about as good as factory. I had to be careful how long I cut it so the bend wouldn't kink, but Gates 28480 looks like it's gonna work out great.