Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2018 Contributors:
StarDiero75, curts56, DannyG, B RON CO, wsa111, Captainslow42, falconcritter
Econoline, THE FRENCHTOWN FLYER, 95FordFleetside, turbo6, Max_Effort, WorldChampGramp
cr_bobcat, C.S.Designs, pmuller9, gus91326, rwbrooks50, rocklord, drag-200stang, Big64my79Effie, CNC-Dude, gb500

2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry

Unknown->> M.Ketterer, T.Smith, J.Myers, P.McIntire - Please PM me (1966Mustang) and lemme know who you are!

1968 Ford F250 with 4.9 ltr six

Moderator: Mod Squad

spider
Registered User
Posts: 11
Joined: Mon Apr 02, 2018 7:39 pm

1968 Ford F250 with 4.9 ltr six

Post #1 by spider » Thu Feb 14, 2019 11:01 am

Howdy all, I just picked up a 1968 Ford F250 with a late model ( was EFI) 300 six in it. They put the 240 intake and exhaust on it and it runs good but lacks the torque going up hills. It has a Dana 60 rear axle with 4:10s in it. I know that if I install the late model split exhaust manifolds, that'll make a big difference. My question is, does the 240 carb have a smaller main jet in it compared to a stock 300 six?

User avatar
bubba22349
Global Moderator
Posts: 9057
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: 1968 Ford F250 with 4.9 ltr six

Post #2 by bubba22349 » Fri Mar 08, 2019 3:12 pm

spider wrote:Howdy all, I just picked up a 1968 Ford F250 with a late model ( was EFI) 300 six in it. They put the 240 intake and exhaust on it and it runs good but lacks the torque going up hills. It has a Dana 60 rear axle with 4:10s in it. I know that if I install the late model split exhaust manifolds, that'll make a big difference. My question is, does the 240 carb have a smaller main jet in it compared to a stock 300 six?


My best guess is that yes the jetting of the 240 carb is smaller than what was used on the 300 engine. You are correct that the later EFI exhaust manifolds would be of a great help too. What ignistion system does your 300 have? Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6025
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 1968 Ford F250 with 4.9 ltr six

Post #3 by THE FRENCHTOWN FLYER » Fri Mar 08, 2019 6:31 pm

The 240 carb may be smaller.

BUT

Do not confuse CFM capability with the A/F ratio of the carb. Re-jetting the carb will not increase air flow, which you need. It will only make the mixture fatter, which you do not necessarily need.

Think of the carb as a chocolate milkshake.
The amount of chocolate syrup determines the mixture.
The diameter of the straw determines the volume capability.
Two unrelated factors.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

User avatar
old28racer
Registered User
Posts: 586
Joined: Wed Apr 12, 2017 3:27 pm
Location: Camarillo, CA

Re: 1968 Ford F250 with 4.9 ltr six

Post #4 by old28racer » Sun Mar 10, 2019 11:03 pm

I have a 1971 F250 300 with a C4 & 4.10 gears. It has a set of split 6 headers & dual 2 1/2" exhaust. I really feel like the EFI split exhaust manifold are as good flowing as the headers on a stock 240 or 300 motor. My motor has a hogged out 300 log intake manifold with a 2V carb adapter that runs a 300 cfm Holley 2V carb. I am very happy with the trucks performance with the bed full of junk. I will be installing a edelbrock C manifold with a autolite 2150 2V carb & adapter later this year & converting the point distributor to pertronics. Both changes should add some more power to the rig.
Image
Image
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6025
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 1968 Ford F250 with 4.9 ltr six

Post #5 by THE FRENCHTOWN FLYER » Mon Mar 11, 2019 12:00 pm

I really like that air cleaner - reminiscent of the old Ford FE multi-carbed air cleaners. With a different base it would surely work and look good with two 2150 2Vs on a Clifford 2x4 manifold.

(Your chrome dipstick looks like it has a light bulb on top LOL.)
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

User avatar
old28racer
Registered User
Posts: 586
Joined: Wed Apr 12, 2017 3:27 pm
Location: Camarillo, CA

Re: 1968 Ford F250 with 4.9 ltr six

Post #6 by old28racer » Mon Mar 11, 2019 12:44 pm

Clifford 2x4 Intake Manifold, talk about something hard to find. :nod:

If I could find one I would put it on my "Street Build 300 motor" and drop it in my
truck :thumbup:
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6025
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 1968 Ford F250 with 4.9 ltr six

Post #7 by THE FRENCHTOWN FLYER » Mon Mar 11, 2019 1:05 pm

FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

1986F150six
Registered User
Posts: 305
Joined: Wed Oct 24, 2012 3:11 pm
Location: Northwest Alabama

Re: 1968 Ford F250 with 4.9 ltr six

Post #8 by 1986F150six » Mon Mar 11, 2019 1:46 pm

old28racer wrote:Clifford 2x4 Intake Manifold, talk about something hard to find. :nod:

If I could find one I would put it on my "Street Build 300 motor" and drop it in my
truck
:thumbup:


https://www.ebay.com/itm/FORD-300-6-cyl ... Sw9oFchIUd

https://www.ebay.com/itm/Clifford-Perfo ... SwvcVa18ud

Gasp [regarding pricing]!

User avatar
old28racer
Registered User
Posts: 586
Joined: Wed Apr 12, 2017 3:27 pm
Location: Camarillo, CA

Re: 1968 Ford F250 with 4.9 ltr six

Post #9 by old28racer » Tue Mar 12, 2019 12:32 pm

Very nice EFI Plenum intake you built (FTF) but I do not have the tools to build one.

$1000 + for a Clifford 2x4 intake is out of range. I really think my mild 300 street build will be fine with an Edelbrock C, 4x2 adapter and a 1.08 2150 2V carb. A lot of 240 & 300 are over carbed when in stock or mild build. My stock innards 300 in my truck runs real nice with a Holley 2V, I just do not care for Holley 2V carb. The Autolite 2100 / 2150 are much easier to tune & work on.
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

Who is online

Users browsing this forum: No registered users and 19 guests