Would I be correct thinking that you didn't lose much fuel mileage from stock when you went for power and displacement?
It worked out beautifully. I remember when I was here
>about ten months ago contemplating this project and
>seeking advice, it was you who helped make up my mind
>on making it into a 400. That turned out to be a
>good decision.
>
>The original 351 was somewhat lethargic at the low
>end. The 600 CFM would 'bog' until it hit around
>3000 RPM. Not no more! Between the higher lift
>on the cam, the raised compression and the extra
>fifty-something cubic inches of displacement, the
>low end is really there now. The 2500 stall Hughes
>convertor probably helped some, too. Hit it from
>a dead idle and it doesn't bog down anymore. That
>four barrell comes to life immediately.
>
>The project came out better than I had even planned.
>This car is almost scary powerful now. Really a
>lot of fun, just have to make sure not to have too
>much fun. One of these days soon, I plan on taking
>it to the local strip just to see what it will do
>on the quarter mile.
>
>Thanks for the help way back when. It payed off.
>
> Steve
>
>
>
>
>Whole Lotta Tom wrote:
>: I was wonderin' how it all worked out. I'll just bet that thing would love
>: a 750 CFM carb. Now, adapt an AOD and add some 3.90 gears, heh heh. >
>: --
>
>: Tom
>: Thunder Snake #3
>: "Li'l Thunder '58"
>: See it here:
>:
formatting link
>
>
>
>: > Yes, the 400 can be made very lively. Just completed
>: > making a 351M into a 400. Has 9.3:1 forged pistons,
>: > 268 degree/.500 lift cam, 600 CFM w/ 4bbl intake and
>: > headers with dual cats. It's in a Ranchero which
>: > weighs in at 4300 lbs. The thing pulls like a
>: > Saturn rocket booster! Way more power than I actually
>: > need for just cruising, but a lot of fun.
>: >
>: > Steve
>: >
>: >
>: > Mario VanWiechen wrote:
>: > : I agree with some work like a camshaft actually ground to make HP and an
>: > : intake and 4 barrel carb. 400's can be woke up and make a good engine. >: >
>: > : > The 400 (no "M") and the 351M are essentially the same engine. The >: 351M
>: > : > uses a crank with a 3.5" stroke (.5" less than the 400) and pistons >: with a
>: > : > lower pin height. A good rebuild of your 400 will help it perform >: well,
>: > : and
>: > : > there are some aftermarket parts to get more power if you are >: interested.
>: > : > The dropping 48 cubes will not help your gas mileage much as this >: engine
>: > : is
>: > : > not very efficient. Low compression, crude smog devices and a carb >: don't
>: > : > allow much room for efficiency.
>: > : >
>: > : > --
>: > : >
>: > : > Tom
>: > : > Thunder Snake #3
>: > : > "Li'l Thunder '58"
>: > : > See it here:
>: > : >
formatting link
: > : >
>: > : >
>: > : >
>: > : >
>: > : > > I have a '77 F150 4X4 with a 400M engine and C6 transmission. The
>: > : > > engine has a two barrel carb. The engine has low oil pressure and >: gets
>: > : > > poor gas mileage. I would eventually like to replace the engine. I
>: > : > > will probably replace the 400M with a 351M. Is there any other >: engines
>: > : > > that will work in the truck without changing transmission and >: possibly
>: > : > > transfer case?
>: > : > >
>: > : > > Thanks in advance!
>: > : > >
>: > : > >
>: > : > >
>: > : >
>: > : >
>: > : >
>: >
>: >
>
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