Super Six Question

[MOPARJ]

I just purchased a 74 Gold Duster with a Super six setup on the /6. It runs great, but milage is down a but it seems. I will go through all of the tune up procedures. I did notice a manifold leak and it would appear that the exhaust manifold does not have a real gasket. It would appear that RTV sealant was utilized instead by the previous owner.

What the hell!! Cmon, that is ridiculous.

Could this be negatively affecting milage significantly? I dropped from just below a half tank to below the 1/4 mark in about 35 miles of freeway driving at 65 mph. I havent had the car long enough to survey the numbers (only two days), but something doesnt seem kosher.

 

[linc]

well vacuum leaks hurt mileage!! Is the 2 bbl a carter bbd? A bbd from a 318, or a /6 jetted bbd? Does the distributer vacuum advance work? Misadjusted or not adjusted vales hurt too. Larger exhaust diamater helps too.You can get 20 mpg's if you work at it.

 

[player1up]

are you following the miserable mileage thread?
http://www.forabodiesonly.com/mopar/showthread.php?t=34260

Same thing happened to me when I did the super 6, Mileage suffering but it was running fine. Well apparently I was able to tune it with a huge vacuum leak at the carb and intake manifold, and the egr valve didn't have a gasket, take nothing for granted. Mine now gets 20-22MPG on the hwy if I stay around 65
or you may have a bad sending unit... only if you could be so lucky..Previous owners do strange things but it sounds like the duster is in capable hands now :thumleft: