Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > 335 Series- 5.8/351M, 6.6/400, 351 Cleveland
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-09-2003, 10:59 PM
Fusion Fusion is offline
New User
 
Join Date: Feb 2003
Location: ND
Posts: 17
Fusion is starting off with a positive reputation.
400 mpg?

Hey all, I just installed a fresh 400 rebuild in my truck, same motorcraft 2v carb and manifold, stock rebuild except for timing chain and cam. My mpg right now is around5-6 intown, I know motors are tight when they are fresh but this seems really low. Before the rebuild I could count on around ten in town and 14 Hwy, maybe I will gain 1-3 mpg's after breakin. But this is worrying me.

What are you people getting for mpg with your 400's?
Reply With Quote
  #2  
Old 03-10-2003, 05:30 AM
shazam shazam is offline
Elder User
 
Join Date: Feb 2001
Location: Porterfield
Posts: 829
shazam is starting off with a positive reputation.
400 mpg?

Here this should make you feel better .

In My Pull Truck I run Low Range 2nd Gear during a pull.Most pulls are 300 feet long. I usally end up in the 285 to 295 foot range.
I burn 3 Gals of Phillups B 33 racing fuel at $9.50 a Gal. per pull, And I pull in two classes at each event .
So every two runs it cost me about $57.00 .... How far can you go for $57.00 in your Truck.
__________________
Blew UP my 435... Moving on up to a 509 BB..
Reply With Quote
  #3  
Old 03-10-2003, 01:43 PM
78bigbronco's Avatar
78bigbronco 78bigbronco is offline
Posting Guru
 
Join Date: Jan 2003
Location: Central Ohio
Posts: 1,700
78bigbronco is gaining momentum as a positive member of FTE.
400 mpg?

Well I have a '78 currently with a 351M c6 tranny, 33" tires, 3.50:1 rear end and around town I get about 8-9mpg. Its a stock rebuild except I added edelbrock aluminum intake, holley truck avenger carb (670cfm), free flowing dual 2.5" exhaust with dynomax headers. But I am still tunning in my carb and timming. Its been an ongoing tunning adventure lol!
__________________

09 F-350 V10 4x4 6spd CC/8' ordered 5/26/09 delivered 7/6/09
99 F-150 V6 4x4 5spd RegCab/Short bed
78 Big Bronco 4x4 (a work in progress)
Reply With Quote
  #4  
Old 03-11-2003, 10:20 PM
Fusion Fusion is offline
New User
 
Join Date: Feb 2003
Location: ND
Posts: 17
Fusion is starting off with a positive reputation.
400 mpg?

Thanks for the info, guys. I know I will at least get 8 mpg after a thousand or so miles, I just felt that what I was getting seems really low.
Reply With Quote
  #5  
Old 03-12-2003, 11:36 AM
beartracks's Avatar
beartracks beartracks is offline
Postmaster
 
Join Date: Nov 2000
Location: Albuquerque
Posts: 4,401
beartracks is starting off with a positive reputation.
400 mpg?

I would make sure you don't have any restrictions in the intake or exhast. Also use as much initial timing as you can. It will pick up the power band on the bottom end.
__________________
Bear Tracks

1977 F-100 Ranger XLT,400,C6,GV
Mod's Listed in Gallery

Click Here To Help Support FTE
Reply With Quote
Old 03-12-2003, 11:36 AM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Best upgrades to improve my 351M's performance? defiantoutlaw 335 Series- 5.8/351M, 6.6/400, 351 Cleveland 3 01-03-2014 01:49 PM
Real world diesel MPGs jl429 General Diesel Discussion 6 09-19-2013 06:13 PM
How long for engine break in to max MPG nickstl77 2009 - 2014 F150 33 11-19-2012 08:36 AM
Success for 351m/400 build F-250 WARHORSE 335 Series- 5.8/351M, 6.6/400, 351 Cleveland 0 02-04-2010 05:38 PM
460 to C-4 question gilllawn Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 6 06-24-2009 10:12 AM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > 335 Series- 5.8/351M, 6.6/400, 351 Cleveland

Tags
1979, 351m400mpg, 400, 400m, axle, big, block, ci, code, engine, ford, motor, mpg, mph, truck

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 11:27 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup