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Mar 21, 2005 | 12:29 PM

#16

kwanderi

Senior User

Joined: Jan 2004

Posts: 157

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From: Buckeye, AZ

John,

I didn't do for the mileage. The points needed replacing, so I went electronic. The wires/plugs were in support of the new ignition. The carb turned out to be next weakest link in the chain, so I replaced that too. The mileage increase was just a bonus.

This truck is not my daily driver, in fact, it barely gets started weekly. I use it maybe a couple hundred miles per month.

Keith

Mar 22, 2005 | 08:14 PM

#17

baitmaster

Posting Guru

Joined: Mar 2003

Posts: 1,622

Likes: 0

From: nevada

it all adds up

Go to my gallery to see what I have on my 390. My mileage didnt get much better, but I get to where I want to go faster. And when you pop the hood at the gas station, people tend to look in there. Just keep buying parts!

Mar 24, 2005 | 08:02 AM

#18

Gunfighter398

Thread Starter

New User

Joined: Oct 2004

Posts: 12

Likes: 0

Quote:

Originally Posted by orich

This will save u alittle gas & give u MorePower.If you have a good clean
cooling system go with a Electric cooling fan setup. Basically the fan is only needed in city driving..my 2cents

orich

Good idea, Thanks ORICH

Mar 24, 2005 | 08:05 AM

#19

Gunfighter398

Thread Starter

New User

Joined: Oct 2004

Posts: 12

Likes: 0

Quote:

Originally Posted by Beemer Nut

If the truck is a keeper spend some money and get your new headers coated inside and out with a ceramic coating like HPC. This will keep the heat in the pipe and away from the engine compartment and starter. You will gain a few % in performance with the coating as will as extend the header life from rust out.

Carl....=o&o>....

Another good idea, Thanks Beemer Nut

May 5, 2006 | 10:33 AM

#20

Wyof250

New User

Joined: May 2006

Posts: 6

Likes: 0

Plug Gap

What manifold and plug gap are you running?

Quote:

Originally Posted by Unimog005

I went from 10 MPG to 14 MPG by simply "bolting on" the Edelbrock 1406 to my 390. Still using the old distributor....I have replaced the plugwires and have installed new NGK plugs. I bought my new carb from a local auto parts chain for about $300.

May 5, 2006 | 11:10 PM

#21

Rubiranch

Logistics Pro

Joined: Jun 2004

Posts: 4,765

Likes: 3,378

From: South Central Utah

I added an "S" intake I bought for $50. I already had a very nice Motorcraft 4300 4V off a 1974 460 pickup. It runs better in the mid-range and at WOT. I am happy with the gain in performace for only adding a 4V carburetor. The truck already had dual exhaust.

I have no idea if it improved or hurt the gas mileage because I have only "roughly" checked the mileage one time and it was a little over 7 mpg. I had a little over 1200 pounds in the bed and was towing our 19' travel trailer loaded for camping for 4 days.

I haven't checked the mileage while empty and don't drive it enough to care but I can tell you it does like gas.

Last edited by Rubiranch; May 5, 2006 at 11:13 PM.

May 18, 2006 | 09:32 PM

#22

baitmaster

Posting Guru

Joined: Mar 2003

Posts: 1,622

Likes: 0

From: nevada

I changed a lot of stuff on my rebuilt 390 (list is in my gallery), so I ended up with a lot more power and the same mileage as my old motor with everything stock.

May 19, 2006 | 01:10 AM

#23

blown406

New User

Joined: Mar 2006

Posts: 6

Likes: 0

From: Grants Pass, Oregon

Engine Heat - Exhaust

Quote:

Originally Posted by Beemer Nut

I would like to add that getting the headers coated removes a great deal of heat from under the hood also. I can put my hands on my headers within a couple minutes of shutting the engine off on my blown 406. The starter is cool enough, you can lay your hand on it any time, but without the coating there was no way.