The 4.7 equates to about 273". Does anyone think that even with today's efficiencies that 273"s is enough in a truck? The 4.7 is not a bad engine, I just think that they ask too much of it.

And the 3.9 is in a similar circumstance. Not a bad motor, but is just too small to do what they want it to do, day in and day out. Personally, I would much rather have the GM 4.3. I am not a Chebby fan, but the 4.3 has proven to be a reliable and powerful motor in the chassis that GM has put it in. The 3.9 has not.

I would NOT buy a high mileage 4.7 in a truck. Just my opinion. The 2.0, 2.4, 3.3, 3.8 and the 5.7 are very good engines by any standard. However, the 2.7, 3.9, and 4.7 engines have not had as good a service record.