My boss had two 1978s and a new 1979. The 79 lasted the longest. He babied it. Best fuel mileage ever was 19 MPG on a flat highway. At 60K miles, it started blowing head gaskets - and had already had the injection pump fail once. We then installed the newest GM "computer designed head gaskets" and new bolts. Remember, around 1980 - "computer designed" sounded very high-tech. It then lasted 8K more miles and blew the gaskets again. We put in yet another new super-duper GM upgrade and they lasted 2000 miles. We then insalled a low-mile 350 from a wrecked 1980. A month later, the crankshaft snapped in two. At that point, my boss gave up on the diesels and we installed an Olds 350 gas engine. After getting 8-9 MPG with it, he got rid of the truck. In 82, he bought a new 1/2 ton truck with the 6.2 and loved it (except for the lack of power). I had trouble convincing him that a 379 diesel had less power then a 350 gas engine - not more.
I'm sure you know that the first sign of a bad head gasket in a 350 diesel is . . . the heater stops working at low speed. That's something you notice fact here in the northeast.
We had a virtual mountian of running 350 diesel engines that we'd yanked out. Some guy came up from Florida and bought the whole mess. He said they installed those engines on farm equipment in warm areas and got pretty good use out of them. So, who knows? Around here, once the heater stopped working- they didn't get used any more.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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