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Ford 460 Holly 4 barrel to eldebrock 4 barrel 750 cfm carb.. It will not get any better mileage on a heavy motor home.
Our 24,ooo lb. 36' Grand Villa pusher with a Ford 460 and Allison 4 sp transmission gets from 4.5 mpg to 5.5 mpg. Averages just barely 5 mpg. Sometimes a mite worse and somtimes a mite better. Does not matter if its the Holly or Eldebrock. It is on its third ring and pinion gear set. It is now at 5.25 to 1 from 5.375 to 1, with 9R x 22.5 tires. Only thing that changed was less poop on the hills and lower RPM at speed. The only reason we went to the lower ratio was because we would have had to waite 2 weeks to get the right gear set while broke down on the road. It did not change the miles per gallon one whit.
I prefer the Edlebrock for performance. However it is just the seat of my pants opinion. No test were conducted. The Holly needed rebuilt, we opted for the Eldebrock. Fuel milage still just as bad. |
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