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11-09-2017, 09:14 AM | #1 |
Junior Member
Join Date: Nov 2017
Posts: 16
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Fuel used 47-53 Flathead
Hey guys,
New to the forum. Just wanted to pick your brains on what octane you are running in some of your late style flatheads. I recently purchased a 39 ford pickup and want to put in it whats right. Thanks Mike |
11-09-2017, 09:25 AM | #2 |
Senior Member
Join Date: Dec 2010
Location: San Antonio Texas
Posts: 636
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Re: Fuel used 47-53 Flathead
Regular is fine,stay away from E-85.
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11-09-2017, 09:43 AM | #3 |
Senior Member
Join Date: Apr 2014
Location: Minnesota
Posts: 1,165
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Re: Fuel used 47-53 Flathead
I like non-oxygenated, no alcohol. Don't know if you can get it in your state.
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11-09-2017, 11:24 AM | #4 |
Senior Member
Join Date: May 2010
Posts: 218
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Re: Fuel used 47-53 Flathead
If you are in Florida go to a WaWa gas station and get non-ethanol gas its expensive but it won't eat up the rubber parts in the fuel system. Where as the ethanol gas will.
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11-09-2017, 11:40 AM | #5 |
Senior Member
Join Date: Jul 2010
Location: 36 miles north of Albany NY
Posts: 2,943
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Re: Fuel used 47-53 Flathead
I siphoned the gas that was in my tank just recently after I had my carb rebuilt, and put in non-ethenol gas. It may cost a little more but I think I'll save money in the long run by having a better running car, and not having to replace lines etc.
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11-09-2017, 11:52 AM | #6 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,302
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Re: Fuel used 47-53 Flathead
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11-09-2017, 02:20 PM | #7 |
Senior Member
Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: Fuel used 47-53 Flathead
Here, in Iowa, we can still buy non alcohol "premium" gas for 50 cents more per gallon. It is 91 octane. You will get the gas left in the pump hose, but it doesn't seem to cause problems. We have run into unscrupulous dealers who put the cheaper fuel in the premium tanks to get more money, so buy from a good station.
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11-09-2017, 02:32 PM | #8 |
Senior Member
Join Date: Oct 2012
Location: Russia
Posts: 119
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Re: Fuel used 47-53 Flathead
Wow, I’ve never thought what a problem that is for you guys in the States. Here in Russia you can buy 80 octane gas. A couple years ago it was possible to buy 76 leaded. Now ecology gets attention but a lot of farm trucks still use 80 octane.
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11-09-2017, 02:44 PM | #9 |
Senior Member
Join Date: Feb 2011
Location: Buchanan, MI
Posts: 676
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Re: Fuel used 47-53 Flathead
Why penalize yourself by limiting the old ford to non-alcohol gasoline.
A proper carb kit, a newer fuel pump & a good flex line will take away the alcohol worries with no location & price penalties. You can buy 87 octane 10 percent gas anywhere. |
11-09-2017, 03:10 PM | #10 |
Senior Member
Join Date: Mar 2016
Location: LaGrande Oregon
Posts: 865
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Re: Fuel used 47-53 Flathead
Here in Oregon/Washington area there is no problem getting non-ethanol. It is about 50 cents more per gallon.
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11-09-2017, 06:11 PM | #11 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,302
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Re: Fuel used 47-53 Flathead
Same here in Minnesota.
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11-09-2017, 06:30 PM | #12 |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
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Re: Fuel used 47-53 Flathead
Right on. Did that over 25 years ago.
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11-10-2017, 07:56 AM | #13 |
Junior Member
Join Date: Nov 2017
Posts: 16
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Re: Fuel used 47-53 Flathead
Thank you all for all the great feedback!!! Appreciate it!
Mike |
11-10-2017, 08:22 AM | #14 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Fuel used 47-53 Flathead
Fuel octane requirements are determined by the compression ratio (CR). Non-modified flatheads have a relatively low CR and can use the lowest octane fuel available (normally referred to as regular). Modified engines with a higher CR might require a higher octane fuel, but in most cases it is difficult to get the flathead CR high enough to require it.
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