Thread: 390 fuel mileage and HP
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09-26-2006 05:31 AM #3
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390's are great engines, run forever, but gas mileage was never their strong suit. Your headers will help, and the 650 Holley can be tuned for economy easier than most. The gears would be a drawback, too much RPM at speed, an OD trans would help. I've seen 390's get 20 mpg (that's about 14 US) driven in the real world, with maybe 20% more if you baby them. A 69 Mach I is slippery, might get better than that.The '68 Ranchero is still the smaller body, isn't it? That'll help, too. When we ran big block 'Tangs, mileage was the least of our concerns.Last edited by R Pope; 09-26-2006 at 05:33 AM.
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Yep. It’s pretty sad.
Dead!