360 gas mileage
Thread Starter
|
New User
Joined: Mar 2014
Posts: 12
Likes: 0
360 gas mileage
I have a 360 with a Holley 600 cfm vacuum secondary carb. I'm guessing a C4 trans not sure. Currently I'm getting about 10 mpg. I've replaced the main jets from the factory #66's down to #54's. Have a little bit of stumble on acceleration. Which tells me I'm a little to lean now. So I'm wandering what I'm missing that would give me better mileage?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
I have a 360 with a Holley 600 cfm vacuum secondary carb. I'm guessing a C4 trans not sure. Currently I'm getting about 10 mpg. I've replaced the main jets from the factory #66's down to #54's. Have a little bit of stumble on acceleration. Which tells me I'm a little to lean now. So I'm wandering what I'm missing that would give me better mileage?
- Rear gear ratio.. what ya got?
- Weight reduction (Dock bumper and intake manifold each weigh about 80 lbs). The more that can be removed, the marginal increase in mpg. It adds up.
- Aerodynamics... it's a concrete block (bigger than a brick!)
- Less rolling resistance (tire pressure, tire compound, tire width, unsprung weight)
- Driving style/environs.. are you on the flats or deal with rolling hills?
- Engine efficiency... running headers and dual exhaust? After determining if it is right for you, synthetic lubricants.
Elder User
Joined: Nov 2009
Posts: 891
Likes: 0
From: Mayfield, KY
The old adage if ya have to ask you can't afford it applies to my truck with a 360 and its love affair with filling stations. I was only getting about 8mpg last time I checked and then it had stock 2bl intake on it.
Laughing Gas
Joined: Mar 2013
Posts: 1,027
Likes: 5
From: Garner NC
I think with proper gearing, a 240 and a 5 speed on a short bed fleet side with a mostly empty gas tank and a 90lb driver, the 'theoretical' limit would be around 16. As stated, these trucks are as aerodynamic as a billboard in a cross wind.
Mountain Pass
Joined: Apr 2014
Posts: 112
Likes: 0
From: SW Idaho
I'm around 10 to 12 with my 360 and 4:10 gears. Running Holly 4412 C. Moroso old school drop down air cleaner and a tornado. I have been using the Per-Tronix flame thrower 3. The big improvement was re-bushing the dizzy. That alone was a solid ¾ of a mile to gallon increase.
Trending Topics
Posting Guru
Joined: Dec 2001
Posts: 1,668
Likes: 3
From: Lincoln USA
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Elder User
Joined: Jan 2012
Posts: 896
Likes: 0
From: AL
Sounds like a good combination. Can you show us a pic of the air cleaner? What is a tornado?
I'm around 10 to 12 with my 360 and 4:10 gears. Running Holly 4412 C. Moroso old school drop down air cleaner and a tornado. I have been using the Per-Tronix flame thrower 3. The big improvement was re-bushing the dizzy. That alone was a solid ¾ of a mile to gallon increase.
Elder User
Joined: Jan 2012
Posts: 896
Likes: 0
From: AL
nkf
Is your air cleaner the "dropped base" design.
Like this one describes?
http://www.ebay.com/itm/Moroso-Low-Profile-Racing-Air-Cleaner-14-Dia-Round-White-Paper-Element-65910-/291137736597?pt=Motors_Car_Truck_Parts_Accessories&hash=item43c9294f95&vxp=mtr
Is your air cleaner the "dropped base" design.
Like this one describes?
http://www.ebay.com/itm/Moroso-Low-Profile-Racing-Air-Cleaner-14-Dia-Round-White-Paper-Element-65910-/291137736597?pt=Motors_Car_Truck_Parts_Accessories&hash=item43c9294f95&vxp=mtr
Postmaster
Joined: Nov 2012
Posts: 2,806
Likes: 8
From: Langley, BC
Oh, and my spark advance module hardly works at all and the carburetor is heat soaked from the headers. So basically the engine isn't even running perfectly.
Mountain Pass
Joined: Apr 2014
Posts: 112
Likes: 0
From: SW Idaho
Here is the link to then. Tornado Air :: More Power, More Mileage! The picture is for the air tube for never vehicles. We have run a few in over the road trucks we some mixed results. Running around town in my 71 f 250 it has helped some. On the road it has been night and day. When the 390 drops in I’ll run without it and see how it is then try with it in as well. Mine set right on top of the bottom of the air cleaner just above the carb.
It may take a few days before I can upload some pictures. Time is not on my side for the next few day. I will get one of the air cleaner. I do not think them make this style any more.
It may take a few days before I can upload some pictures. Time is not on my side for the next few day. I will get one of the air cleaner. I do not think them make this style any more.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Hey 351. I know Airaid here in town makes a spacer for fuel injected vehicles behind the throttle body. I don't know if they have 'em for carbed. Their spacers are spiral cut on the inner bore so it creates the same effect as this tornado.