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Originally Posted by Phorbes
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Long story short, I took the truck home (on the freeway) and I could barely make myself go above 60MPH because the motor was SCREAMING!
I know it's not damaging anything, just burning fuel. I want this truck to be cruiser, to help pick up supplies at home depot and haul the dogs around in. Not a show truck or a drag racing truck, just a good all around usable truck.
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Don't be so sure you aren't damaging anything. I'm running a temporary engine right now. A very used 307 that is powering its third vehicle while I deal with a self inflicted issue in my 383.
A few weeks ago I took it to the MN State Fair Grounds to meet da-burb who sells new and used truck parts. (I purchased a repop long bed bedside that except for the little angle iron piece welded to the front of the rear stake pocket that I had go move up fit like a glove and looks awesome).
I debated with myself over whether I should take the freeway (70mph for 20 minutes or so) or stick to the back roads. I ended up on the freeway. Turbo 350, stock height tires, 3.73s, 3500 rpms on the tach. I monitored engine temp, tranny temp, and oil pressure all the way down. As the oil heated up the pressure slowly lowered but it stayed above the 1/4 mark - where the tired 350 that shared the same gauge lived.
I get off the freeway, rpms down to in-town levels. OIL PRESSURE BOTTOMS OUT!!! Long story short I think I wiped a lobe on the cam.
I would address the freeway rpms or just avoid it altogether. Those 4.11s with that super low 700r4 first gear might be fun off the line.