4.9 straight 6
#4
Ford's intentions were to create something new and more powerful with the new lineup of trucks coming out in 1997. However, looking back it seems that the 300 is by far the most reliable and long lasting engine pretty much ever. The 300 was also an expensive engine to make compared to the newer 4.2L v6.
#5
#6
Poor fuel economy. Ford has to maintain a government required corporate average fuel economy (CAFE), which increases every few years. The old tech Inline 6 was designed before fuel economy requirements, and it is also a big heavy lunk to haul around.
#7
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#8