I have a '57 F 600 292 with a Holley  C2TE N  A1JB carb. Does anyone have info on the original use? I also have a Ford flat top from a '59 pickup, 1.010 venturi, 1.430 throttle bore.(no tag). Can anyone suggest which one might get better MPG?,,,,other than just try 'em with jet changes? I now get 10-12 w/ OD trans & 2 speed.  THANKS,  Park

Park,

     I don't really know what the jet sizes are in Big trucks like yours, but my Unibodys both have .53's and would think theye'd be pretty much the same. I rebuilt another carb, that was dated 1960 and it only have .50's on it and am running that one currently on one of the trucks, so I would imagin you wouldn't want to be too big and still get a little economy on it. I rebuild my carb's using a kit from Auto Zone thats a GP Sorensen kit part number 96-567 and as $17.99. Do you know does you truck have either a govenor or a "de-popper valve" on it?? De-popper valve is for going down long grades.

                                             Michael

Michael

Sandy Valley, NV

The truck has neither a gov. or valve. I went down a size in the Holley some time ago, I seem to remember it's a 50. The Ford carb has 49's in it. The same jets fit both, but the relationship may be different between them. The venturi layout is somewhat different in these two, that's why I was considering a MPG difference.    EDIT,,found my notes the Holley has a 52 in it now.

It would be very surprising if you're able to improve on 10-12 MPG with an F-600.That's awfully good mileage for that big a truck.

 

Paul,

Boonville,MO

Thats what I was thinking about the milage. Real good for a big truck. Heck my one F250 Uni does that on a "good" day!!

                                                Michael

Michael

Sandy Valley, NV

I agree with Paul and Michael in that 12mpg in a F600 would be considered good and especially when taking into account the rear gearing that came in those trucks.  As far as fuel mileage goes in these big trucks, I came across a severly retarded camshaft in a previously never rebuilt and low mileage fire truck engine.  During the rebuild, I simply reinstalled the factory camshaft so it was in at 6° advance as measured on the intake lobe centerline and the customer claims that it more than doubled the fuel mileage.  The idle characteristics also improved dramatically over what it was prior to advancing the camshaft.

 

Besides jetting, other design factors that are influential on the fuel mileage includes camshaft timing, compression ratio, and ignition timing curve attributes.  That’s the (very) short version of what it takes to improve fuel mileage assuming the engine is in good condition to begin with.

Lorena, Texas (South of Waco)

Thanks for the reply's, guys.I thought I was doing pretty good with what I had, but better would be gooder. I'll try some jets for a start. Very interesting on the cam timing. Ford had many different power & torque ratings over the years with the 292,apparently with subtle tuning changes such as that & ignition variables. ,,,,By the way, the truck weighs just over 7000#,,,