engine swap?
Thread Starter
|
New User
Joined: Apr 2006
Posts: 19
Likes: 0
engine swap?
Hi everyone. I have a 1991 f150 that is a gas hog. I just wanted to know everyone's thoughts on swapping out my 351 for a 300 straight 6. I used to have one in my 95 f150 but that one was a rust bucket and didn't last(engine did though). I plan on doing this in the next year or so. I always liked the economy and torque of that engine.
Thanks, George
Thanks, George
Freshman User
Joined: Nov 2007
Posts: 45
Likes: 0
From: Saint John NB canada
persionally i dont think that it would be that great of an idea, for the simple reason of the time and money you would have to endure... you would be better off doing some minor upgrades, like an intake system, exhaust system, even maybe a diff swap... ( some higher gearing) your 351 engine has lots of power and could handle that type of upgrade... the six isnt that much better for fuel to justify a swap... most of all, ease up on the throttle... that will make you save the most fuel!!
New User
Joined: Sep 2007
Posts: 6
Likes: 0
my uncle had one in his truck
those engines are indistructable he ran his with a bearing knock all the way from wells maine to shelton connecticut with no problems
he tryed to blow up the engine but it wouldnt go he even did the 4th gear going 70 down the highway to first and keept it floored and it didnt blow
and he drove it bout 2 miles with no oil or coolant
totaled the truck droped a cinderblock on the engine and it fell out of the truck
sold the engine and its still runing to this day
so i say go for it
those engines are indistructable he ran his with a bearing knock all the way from wells maine to shelton connecticut with no problems
he tryed to blow up the engine but it wouldnt go he even did the 4th gear going 70 down the highway to first and keept it floored and it didnt blow
and he drove it bout 2 miles with no oil or coolant
totaled the truck droped a cinderblock on the engine and it fell out of the truck
sold the engine and its still runing to this day
so i say go for it
Senior User
Joined: Oct 2004
Posts: 113
Likes: 0
if your main reason is fuel milage then i wouldnt do it. the straight six is an awesome engine but sip the fuel it does not. i only get like 14mpg with it which cant be much more than you're getting with the 351. the 300 will last a lot longer than the 351 but as far as fuel milage goes theres not much difference. i can remember reading threads that talked about swapping the 300 out and putting the 302 in for fuel milage. but if its torque you're after, then look no further than the 300cid straight six.
Thread Starter
|
New User
Joined: Apr 2006
Posts: 19
Likes: 0
Originally Posted by ol' reliable
Hi everyone. I have a 1991 f150 that is a gas hog. I just wanted to know everyone's thoughts on swapping out my 351 for a 300 straight 6. I used to have one in my 95 f150 but that one was a rust bucket and didn't last(engine did though). I plan on doing this in the next year or so. I always liked the economy and torque of that engine.
Thanks, George
Thanks, George
Last edited by ol' reliable; Dec 29, 2007 at 01:02 PM.
Trending Topics
Fleet Mechanic
Joined: Nov 1999
Posts: 1,415
Likes: 0
From: Lower 48
This should be a "fairly" easy swap, if that's what you want to do. You're probably going to need the frame towers out of a truck that had a six in it to properly position the engine fore and aft in the engine bay, and unless you're going to go with a carburated engine you're most likely going to have to steal the computer from a six truck, and I have no idea what that's going to involve. Then you've got the issue of whether or not the trans will bolt up. In years gone by I would have said yes, but there's no telling what block changes have occurred with both of these engines over the years. Good Luck
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Postmaster
Joined: Jul 2006
Posts: 3,978
Likes: 0
From: Central PA
I feel your pain I have had 19 of these truck a and never had a 351 break 13 MPG (more like 10-12 MPG as My records show. .And a well tuned 300 15 plus in same truck . (20 On trip out west 31' and 3:55 rears )
If you have the parts truck for swap go for it . Its you time and even at 2 MPG (i drive 500 a week) adds up. Just know that because of 300-6 low end torc most had 3:08 or other higher gears . But I install 3:55 on every truck I get with 300 and its a great comb
If you have the parts truck for swap go for it . Its you time and even at 2 MPG (i drive 500 a week) adds up. Just know that because of 300-6 low end torc most had 3:08 or other higher gears . But I install 3:55 on every truck I get with 300 and its a great comb