i have a 1974 f250 390cid (6.4L) 2WD. 2bl carb. from what i can tell. the engine is rated @200 horse. i am looking at options for more horses and maybe better mileage. i'm sorta toying with the idea of the 460. it would fit without modifications. and since it was produced till 1995. the later years came with an AOD transmission. bottom line. what size AND year engine could i get more horses and possibly better then 9 mpg of gas. with the speed limit up to 75 and possibly going to 80. i would like a overdrive trans too instead of regearing the rear end. i'm not too fond of 3700 rpm just to do 75 mph. any suggestions. i am looking for a project engine to do a plain rebuild and not a super duper hotrod. i just want to get more UMPHF and better gas mileage without modifying the engine compartment. stock engine sizes are 302(5.0L) 360(5.9L) 390(6.4L) 460(7.5L). THANKSSS
2007-01-28 07:00:13 · 9 answers · asked by snowwy666 1 in Cars & Transportation ➔ Car Makes ➔ Ford
by the way. grandpa bought this truck off showroom floor. my goal is to eventually restore it. one peace at a time.
2007-01-29 03:18:06 · update #1
by the way. grandpa bought this truck off showroom floor. my goal is to eventually restore it. one peace at a time.
2007-01-29 03:27:00 · update #2
Keep it original !! Don't you dare mess with Perfection!!!
2007-02-04 15:27:47 · answer #1 · answered by jacah5 3 · 0⤊ 0⤋
Research the following:
Most F-250s had 4:10 gears in a Dana 60. Try something like
3:50s or 3:25s. Swap the cam and lifters for "mileage"
type grind. Call any of the leading manufacturers and they will
set you up w/ the right grind. Crane and Comp come to mind.
Keep your existing pushrods and rocker shafts. Mileage is
more a function of wind resistance than rolling resistance
and in that regard there is little that can be done due to
your large air "footprint" The existing 2 barrel carb isn't all
that bad. You can probably handle the cam swap but the
Dana will require knowledge and experience, as well as
tools the average guy won't have. That's about as good as you
can expect.
2007-02-01 05:42:24 · answer #2 · answered by belate 3 · 0⤊ 0⤋
the 390 bolt pattern will work with the 360,390 and 428 engines if you install a 460 you need the transmission from a 429 or 460. if it were me and the trans was good I would change the rear gears and put a 4 bbl and cam in the 390. Otherwise get a 460 and tranny then you should only need a few things. Probably motor mounts, drive shaft possibly and cross member for the transmission.
2007-01-28 07:34:57 · answer #3 · answered by Aviator1013 4 · 0⤊ 0⤋
It's gonna be hard to get more fuel mileage out of this truck. For one, you need fuel injection and computer control to peak the newer engines out and make them efficient. Also, the newer transmissions are electronically controlled. You can add and overdrive on the rear of your transmission to give you a little higher ratio and could possilbly put a higher ratio rear end without much cost or modifying. As far as the gas mileage, i would go with a 302. There is a lot of performance items on the market for these engines as well. good luck!
2007-01-28 12:38:59 · answer #4 · answered by cool_jj334 2 · 0⤊ 0⤋
I am not a big personal fan of the 351w , but I have a truck with one in it and its not bad. It has an early 80's AOD that is not electronic controlled. I bought some headers and a cheap aluminum intake off of ebay. I put a stronger vacuum secondary spring in a new holley 600 cfm . I really have to stop the pedal to get the 4 barrels to kick in. I get about 14-15 mpg.
2007-01-28 12:49:15 · answer #5 · answered by 1diputs 4 · 0⤊ 0⤋
The chances are there is a loose wire or bad soldering connection going to or in the cluster dash gauge circuit board.Many times I've found poor or worn soldering connections that can easily be fixed by re-soldering them and many times it's in the ground circuits.On a vehicle that old it's bound to have weak or bad soldering connections bec solder wears down over the yrs and it only takes 8-10 yrs or less for the solder to do this. Hope that helps and best of luck.By the way you'd need to take the cluster gauge assembly out and check the soldering connections closely and if it was me I'd solder all the connections.You can also check the wiring going to the assembly and remember that bad grounds are the main cause of electrical issues.You might have a frayed wire or old wiring that needs to be fixed or replaced.
2016-03-29 06:38:13 · answer #6 · answered by Anonymous · 0⤊ 0⤋
the 460 will only make it worse - you are driving an antique - be happy and show it off - buy a hoopdy to get ya to the far places.
2007-01-28 07:06:05 · answer #7 · answered by tirebiter 6 · 0⤊ 0⤋
Buy a Viper or a Corvette, take the engine and put it in your truck.
2007-01-28 07:03:46 · answer #8 · answered by Transgénico 7 · 0⤊ 1⤋
a '74 f250,i can already tell you its going to look like crap."beefing up"a honda would be better than that,buy a mercedes their already "beefed up."
2007-01-28 13:58:43 · answer #9 · answered by lilchuber1 1 · 0⤊ 0⤋