One Digit Mileage!?!
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Originally Posted by ford390gashog
'74 F250HD LB FE390 4x4 435NP 205NP (deceased! coming soon to a Walmart near you as a pile of bikes)
are you really going to scrap it?
are you really going to scrap it?
Originally Posted by discman
How 'come I only get 10 MPG with my 3.25 gears, 390 with lopey cam, 1/2 ton p/u, 9.7cr, on the highway?
However, lopey cam with only 9.7:1 ??? Maybe that's the reason. Not entirely, but certainly a difference.
Elder User
Joined: Dec 2003
Posts: 531
Likes: 1
From: New Mexico
Those engines are very susceptible to intake issues. Consider using an aftermarket air cleaner that is straight across the base (not a low profile one-so the venturi effect is straightened out) and then get a 4 (four) inch tall filter. The air intake will be clearer, faster and cooler and that should help along with the careful jetting of the carb. Clearance under the hood for the taller filter shouldn't be an issue with the truck.
Senior User
Joined: Aug 2004
Posts: 382
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Originally Posted by 66beater
Things you can do to help would be Removing the tailgate and adding an aero net,
I could be wrong though, any ideas???
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
My cab-height cap enables me to get over 16MPG with my V10 - without it, I get 15.
There are differing opinions on tailgates - I just think it's the design of the truck - you can't compare an '01 superduty SB with a '74 highboy LB
There are differing opinions on tailgates - I just think it's the design of the truck - you can't compare an '01 superduty SB with a '74 highboy LB
Elder User
Joined: Jun 2003
Posts: 686
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From: Edgewood, Wa
I get 8 with my 390. Never better, never worse. Just 8.
Also, mine came with a clutch fan setup from the factory, from my understanding it had to do with ac and heavy duty cooling. I still run it, only with a heavy duty clutch, and I can sit in 90 degree weather all day long, and never overheat. IMHO, its the best cooling performance, however, others results may vary...
Also, mine came with a clutch fan setup from the factory, from my understanding it had to do with ac and heavy duty cooling. I still run it, only with a heavy duty clutch, and I can sit in 90 degree weather all day long, and never overheat. IMHO, its the best cooling performance, however, others results may vary...
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