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Old Jan 27, 2004 | 04:20 PM
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Question Mileage Cam

Just wondering if anyone knows of a cam that gets good gas mileage out of a 400?
 
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Old Jan 27, 2004 | 05:27 PM
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255DEH
 
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Old Jan 27, 2004 | 05:28 PM
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stright up timing chain
compcams 255DEH cam
new valve springs
 
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Old Jan 27, 2004 | 05:37 PM
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How does the 255DEH compare to the stock cam for torque? I get 17.5 MPG with the stock cam.
 
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Old Jan 27, 2004 | 06:11 PM
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17.5 WoW!!
what else do you run to get that kind of mileage?
 
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Old Jan 27, 2004 | 11:39 PM
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I get 16-18 MPG, depending on how heavy the foot is.

Mine is stock, with high performance coil, wires, plugs, cap, rotor, properly tuned 2150, WIX filters, and such.
 
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Old Jan 28, 2004 | 08:32 AM
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my buddy get 16/19 from his 77 F250 4sp
 
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Old Jan 28, 2004 | 04:17 PM
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WoW! It seems I have some mpg hiding in my engine, now how do I unleash them? Hummmm?
 
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Old Jan 28, 2004 | 05:57 PM
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I'd start by reducing your tire size, you are lugging the motor pretty hard turning all that tire.

A good tune up, and a carb rebuild (if necessary), will help.
 
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Old Jan 29, 2004 | 05:09 PM
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Mine's a '71 400 in a Galaxie with 3.00 gears. The original owner said it got 20 MPG when the gas was better.
 
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Old Jan 29, 2004 | 08:43 PM
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Yeah those 35x15.5x15 swampers are my mud tires, the 33's are my street tires. My mileage is about 12mpg with the 33's. My carb needs to be rejetted, I can smell gas in the exhaust. Can that cause my lousey gas mileage? I think my cam is the mager player, its a 268/218 comp cam. I want to switch to a better gas saving cam. Sorry for the long post
 
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Old Jan 29, 2004 | 11:14 PM
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Kopfenjager, don't apologize for giving details, , we need em'.


Yeah rejetting the carb should be a priority, you are throwing raw gas down the pipe if you can smell it.

I'm probably out on a limb here, but is your thermactor system enabled?
 
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Old Jan 30, 2004 | 02:13 PM
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no, all the emmission are un hooked
 
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Old Jan 30, 2004 | 04:12 PM
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At the very least, I would hook up the PCV system.

I'm not sure what else you can do.

I'm sure you are running headers and free flowing exhaust.
 
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Old Jan 30, 2004 | 05:58 PM
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Yeah headers to 2.5 turbo mufflers that dump under the cab. The pvc is hooked up. New cam is what I need, but what one?
 
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