[quote="dhermesc"](quoted from post at 06:50:54 09/20/12) The 4.2 V6 is a light duty engine for light duty trucks. The 4.9 I6 was a low powered heavy duty engine in a light duty truck. If you drive your pickup like a car and only occassionally haul a load the 4.2 will get better fuel mileage and last well over 200K - as long as its not a 1997 model. As long as you have a good radiator the 4.9 can take being abused and used hard much better.
The biggest problem with the 4.9 I6 is the MD50 (5 speed) transmission that is behind most of them. My company had 16 of the these - 8 failed with less than 50K on the clock.[/quote
OOT, People are still ragging on the MD50 X/MIS. I put nearly 200000 miles on one and sometimes it was worked hard.Really hard.Not a single problem,not even aleak.
As far as the 300 CI six is concerned very few gas fueled straight 6's could take the abuse this engine took with the 292 GM a very close second. I loved them both.
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