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Group: Forum Members
Last Active: 7 Years Ago
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I have a 56 Merc rebuilt 312 If i didn't have loud pipes I would a get a lot better mileage, of course I put my foot in the carburetor and I don't have any idea of the mileage and I don't care. Love the old girl it runs and drives great, makes happy when I drive it.
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Group: Forum Members
Last Active: 8 Years Ago
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It is a little different than the 500. Had to go down a little in the secondary's from .095 to .090 to keep from bogging down, also went from .065 x.052. to .067 x.055, seem to make a difference. Built a new motor using .060 312 pistons in a 292 block, so will have to do some more experimenting to get it right "Maybe".
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Group: Forum Members
Last Active: 4 Years Ago
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Thank you. I asked because that combination is in the tune up chart for a 500 CFM carb. You never know what might work until you try it. Thanks for the information.
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Group: Forum Members
Last Active: 8 Years Ago
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The carb is a 1406.
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Group: Forum Members
Last Active: 4 Years Ago
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Dave5564 (11/4/2017)
Have the carb off now building new motor. Will check jets and rods and let you know. Have run this set up about 10 yrs seems to work great. Yes, Thank you! If I might ask you one more question, What is the model number of your carb stamped on the base?
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Group: Forum Members
Last Active: 8 Years Ago
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The jets are .086 primarys and .090 secondarys. Used 6755 metering rods and looks like orange springs. Hope this helps.
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Group: Forum Members
Last Active: 8 Years Ago
Posts: 19,
Visits: 61
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Have the carb off now building new motor. Will check jets and rods and let you know. Have run this set up about 10 yrs seems to work great.
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Group: Forum Members
Last Active: 8 Years Ago
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My mistake, 3:89 gears. Sorry.
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Group: Administrators
Last Active: Yesterday
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Dave5564 (11/3/2017)
I have a 1955 Ford Customline 2 dr. with the 272. Using the later distributor and 57 manifold. Running a jetted down 600 Edelbrock. With stick and overdrive and 4:89 gears. Got back from Montana and got between 21 and 22 mpg. Did you mean 3.89:1 rear gears?
  Lorena, Texas (South of Waco)
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Group: Forum Members
Last Active: Last Year
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My 57 Ranchero has a +.040 312 with an Isky RPM 300 cam, late style magnetic pick up distributor triggering a 4 pin HEI module, 3 speed overdrive, 4.30 rear gear and a 735 cfm Holley with stock jetting on a modified B manifold. My odometer has been verified with a GPS. I'm getting 16.5 mpg on 89 octane combined city and highway.....includes 'getting on it' on a regular basis.
"FREE SAMPLE"
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