I'm looking for another truck one choice has a 5.8. Is there a signifigant difference in gas mileage between the 5.0 and the 5.8.
Which of the two engines would others choose? Looking for opinions and pro and con.

 

Ive had both. Ill take the 351

 

Unless you're just looking at a 2wd reg cab for a commuter get the 5.8, there ain't enough difference in fuel milage between the two motors to make it worth short changing yourself an a real truck engine.

 

Ive experienced both, although one was a carbed 5.8. (1986 model truck)

The carbed 5.8 got terrible fuel mileage, and it was a ford factory reman engine.

I get much much better economy with my 302 truck. (2wd, 308 rear diff, 5 speed reg cab reg box) Reliability of the 351 we used to have was poor, hence the factor ford reman engine, and it left a poor taste in my mouth .

Real truck engines dont have spark plugs my friend

 

I agree...(at least for a 2wd application...stroke a 5.0, use the late 90's EFI heads, headers and plenty of air...1986 F250 circa)...put a ZF 5 speed in back of it and 3.73 gears. I can outpull both a 300 6 and 5.8 and I also get 22mpg(not bad for a speed density motor)...For heavier duty applications, I love my 7.5 stroker...the 5.8 is a good in between motor but the fuel milage sucks (Once again, just my opinion based on 20 years now of running EFI trucks, and carb is definately different...not to mention 4wd applications)>

 

There's no replacement for displacement.

 

except fuel milage (3.59 a gallon up here means you can't go far with displacement)!!!

 

I'm looking at several different trucks, all 4x4s. I haul a small camper sometimes, but mostly local hunting, fishing trips.

 

5.8 all the way. He's talking stock for stock. Of course a stroked and modded 302/347 "might" out pull a stock 351. But that's apples to oranges.

 

5.0 I have owned several of both. Unless your hauling big trailers, the 5.0 will get you where you want to go.

Dont get me wrong the 351 is not a bad motor, But both of them ( EFI ) that i have owned got really poor fuel mileage compared to my 5.0 . All were automatics with overdrive so I am comparing apples to apples.

 

AMEN!!!!

 

5.8, doesn't work as hard to move the truck as the 5.0

 

ill never own another 302. slow and bad mileage. misewell be fast"er" and get bad mileage.

 

It all depends on the years , i would rather have a 95 302 than a 85 351 , i also would not want a 85 302 , the smog motors just suck what ever you have ...The 94 up motors are just better....Lew

 

ive experienced both and neither get good gas mileage so why not get the one with more power...id say go 351!