Inline Six
Thread Starter
|
Junior User
Joined: May 2004
Posts: 66
Likes: 0
From: Idaho Panhandle
Inline Six
I was wondering if anyone has a 300 Six in their truck? I am thinking of putting one in mine to replace my 351M as it gets 10 MPG and I cant justify driving it. Would a six give me noticably better mileage with my 350 axle gears?
Thanks,
Bob
Thanks,
Bob
Cargo Master
Joined: Jul 2005
Posts: 3,495
Likes: 7
From: Not as far west as I want
Originally Posted by mwielgosz
I agree with Torque1st. I mean, unless you have the six laying around, you'll spend more swaping motors than you will on fuel savings.
I get somewhere around 15 mpg with my 300.
I get somewhere around 15 mpg with my 300.
Lead Driver
Joined: Jun 2006
Posts: 5,676
Likes: 998
From: Near Yosemite CA
I have the 300 in my 66 and get 15-17 if I drive it nicely, (keepin my foot out of it 
) which isn't easy all the time! And if I humm down the road around 60....
I have the 351Measly in my 77 4x, I get about 10-11, I keep thinkin about a swap, but 77 is a friggin smog year so I am thinkin of going to 400 so it still looks the same,
If ya had a 300 layin around I would do it. If not, I agree with Torque, cost more than you'll save.
) which isn't easy all the time! And if I humm down the road around 60....I have the 351Measly in my 77 4x, I get about 10-11, I keep thinkin about a swap, but 77 is a friggin smog year so I am thinkin of going to 400 so it still looks the same,
If ya had a 300 layin around I would do it. If not, I agree with Torque, cost more than you'll save.
Senior User
Joined: May 2007
Posts: 184
Likes: 0
I have a 300-6 in my 78' and i wouldnt trade it for the world. Its got a 0.060" Shaved head, 3-angle valve grind, minor port/polish work (done by me and my dremel), a Clifford 264H cam, Clifford 4bbl intake, Clifford headers, a Dual exhaust with super 40's, 35" mud terrains, 4.27 gears, and a 4-speed. Although i have to run 87 Octane gas, i see a little over 16 mpg and 220hp at the wheels. BUT!!..... get this.......390 lb-ft of torque at 1800 RPM's. It never overheats, never quits on me, loves to be revved (4500 RPM redline sucks tho) but throw it in 4th on the highway, you will never have to shift no matter what the hill grade is. Those engines friggin rule.
Trending Topics
Senior User
Joined: May 2007
Posts: 184
Likes: 0
sorry 89** octane gas. But if your looking for a cheap mod that increases both horsepower and torque, use chevy 250-292 rocker arms. They are a 1.7 ratio versus the fords 1.6 and give you another .25" lift on your valves. They are a direct bolt on if you have 3/8" stud mounted pedestals (almost every ford 300 has them). Good luck and i hope you go with the 300
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Senior User
Joined: May 2007
Posts: 141
Likes: 0
From: Morenci, AZ
I've had a 78 F250 4x4 with a 351M, and an 84 Bronco with a 300 - the F250 actually got slightly better mileage (both were 4 speeds, lifted 4", running 33" tires). Average mileage was around 17 for the F250, and 14 for the Bronco. I get around 17 with the 360 in my 74.
With the 351 finely tuned, and a light throttle foot (this is the big one!!), it will get pretty decent mileage. Swapping will likely end up costing more than you save in the long run.
With the 351 finely tuned, and a light throttle foot (this is the big one!!), it will get pretty decent mileage. Swapping will likely end up costing more than you save in the long run.
Posting Guru
Joined: Nov 2006
Posts: 2,140
Likes: 0
From: Louisville,Ky.
Originally Posted by Jermafenser
If your 351M is getting 10MPG, something is wrong.
1) Tune the carb
2) Give it a complete tune-up
3) Replace all fluids and filters
4) Unload junk in bed & cab
1) Tune the carb
2) Give it a complete tune-up
3) Replace all fluids and filters
4) Unload junk in bed & cab
More Turbo
Joined: Jun 2006
Posts: 601
Likes: 0
It all depends on your budget. I might hurt some feelings here, but the 300 is just a better motor than the 351M. If you had a 400, I would say keep it and tune it. Myself, I would swap a 351M with a 300 in a heartbeat. Like Tha_Stepside said in a previous post, the 300 has a kind of "cult following". Once you own one, you never want to get rid of it. Just my opinion?.
Senior User
Joined: May 2007
Posts: 141
Likes: 0
From: Morenci, AZ
My F100 is a 360 4x4, NP435, running 33's and whatever the stock gears are (haven't gotten that deep into it yet). All I've really done to it is tune it (my vac. gauge is my best friend!), and stay out of the throttle. My mileage on the last two fillups has been 16.4 and 17.1 mpg respectively.
so I guess it was worth it for me