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My 89 Ranger just died, and I am upgrading. I was advised a few years ago that the slant 6 cylinder that they quit putting in the F-150's in 1997 can commonly hold out for 200,000 miles or more.
Is this true, or are they no more durable than a V-8?
Its a straight six, not a slant six. The slant six was a Dodge motor(It was also very durable too). And yes you heard correctly the 300 can easily go for 200,000+. Ive heard stories of it going over 400,000 with proper maintance.
The 300 six is one of the most durable motors out there. If you look in the engine section of this forum you can find a series of posts where people were giving testimonials of how long their 300s were lasting. Most were close to 190K and still running strong. One person had one over 400K. Mine is close to 150k and it still runs awesome.
You can also find a guy trying to put a 300 in his 84 Ranger, so you can get some good ideas there. He didn't like my suggestion of putting a propeller on the crank snout as it might be sticking out that far.
Are you going to upgrade your motor or your rig?
If you are looking for a newer truck, I would go with the later efi 300's. They make a little more power and I think the two 3 into 1 manifolds don't come loose as easily as the carb models 6 into 1 manifold.
It won't be a gas mileage champ, but will be better than a v8. It won't rev to the moon, but then it won't have to.
Good luck