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Old 01-21-2019, 02:12 PM
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Dwight Dwight is offline
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Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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I've told this story several times so today it's the short version.

Mike picked up his Cobra with a new KC 530 hp 408W. Drove it 130 miles home. Called me and said he was getting 7 mpg. I told him to bring it back and I would get Coach to tune the carb.
After the tune he was getting 13 ish. The next year I drove it to the London Cobra Show (1135 miles) and got 14.7 mpg.

My suggest is to get the carb "tuned", that is more that idle screws and air bleed adjustment.
Check the jets and power valve. I have never seen a new carb out of the box that was dead on. Most have jets that are to large.
We have several big block Cobra in our group and they get over 11 mpg.
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