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OK. My dad says that he found the problem. Apparently the new Road Demon carburetor (4 barrel 750) was having a linkage problem. Basically, the progressive linkage stopped functioning properly and, even at partial throttle, the secondaries were opening. Not completely but enough to make a difference. This would also explain why the car seemed to have changed it's acceleration characteristics.

Basically, as I understand it, we'd push the pedal only very lightly but it'd be equivalent to half or more of the pedal. This accounts for the fact that even light-footed exercises in the car for testing purposes didn't change gas consumption characteristics.

Anyway, thanks for all the help. We're sending the Demon back to get fixed. Is this a first time hearing about a problem like this? You'd think that an expensive carburetor like a Road Demon wouldn't have these silly mistakes... Save those for Holleys, right? =)

Dang V8s... Nothing but problems.
 
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We had to send my brother inlaws Demon carb back 3 times before we got one that wasnt damaged. I use Holleys on my own cars, never had a problem with them
 
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I was told that a Holley was a "Controlled leak". But I can never get mine controlled. I have two filters and trash still collects on the needle, it pours fuel in the motor when car is off till there is no fuel left in the upper part of the bowls. I take them out the top blow em out and I am good to go again. I was thinking about changing over the carb to what your running, cause my carb has left me F----- on the side of the road flooded out.
>64 1/2 Pearl Orange Coupe
>302 C4 B&M shift kit star shifter
>True Dual 3" Flowmaster
>Headman Headers
>Edlebrock Performer intake, roller cam
>Holley 600 e/choke
>TOO bad its still slow
 

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The Road Demon is a great carburetor - We use one on the family grocery getter with no problems...

We called the company and they offered to pay shipping so I'm happy, and so is my dad...
 
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