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EFV-8 Club Forum / General Ford Discussion / type of Gas to use

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Discussion Topic: type of Gas to use -- page: 1 2

gfstew

02-24-2019 @ 7:17 PM

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For all you Members who have flat Head for V8 Engine in your car. What is a good brand of gasoline to use in my Flat Head Ford V 8 Engine ?? I live in Nevada and in the summer it gets hot here ,I have been talking to some Guys about what type of gas to put in are cars, I have been told to put Union 76 91 octane rating and add Amsoil P.I. Performance improve Gas additive any suggestion ??

ford38v8

02-25-2019 @ 12:09 AM

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Union 76 is as good as any other major brand, and is usually cheaper . 89 octane is all you need and want in a flathead. Additives are generally considered to protect and stabilize the fuel for long term storage, and as a rust inhibitor, as the ethanol products do absorb water, in which oxygen is the enemy. I have no idea what kind of product "Amsoil Performance Improve" is, but the name itself suggests no more than the usual snake oil.

Alan

ken ct.

02-25-2019 @ 5:47 AM

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I use the cheapest reg. 87 or 89 reg gas I can find .All ct. sells is 10% alchol. Add some Seafom to the tank in the winter mths. and a little MMO to the gas ocationally. Runs fine. No need for hi-octane gas. OMO ken ct.

Drbrown

02-25-2019 @ 7:14 AM

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Your in a hot climate and ethanol gas becomes more of a problem re vapor lock so non-ethanol the better choice. I don't buy non-ethanol here in NY State cause don't need the higher octane and the prices are out-of-sight.

Being in the northeast I use reg 87 oct/ 10% ethanol; no vapor lock problem cause I have a noisy 6-blade fan that moves a lot air thru the engine compartment, and I had my fuel pump and carb rebuilt to resist ethanol. I too add MMO to gas to avoid sticking valve sleeves.

This message was edited by Drbrown on 2-25-19 @ 7:17 AM

TomO

02-25-2019 @ 7:58 AM

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here is what the manufacturers say about their additives

https://www.amsoil.com/shop/by-product/fuel-additives/gasoline/p-i-performance-improver-gasoline-additive/

https://seafoamsales.com/product/sea-foam-motor-treatment-oil-fuel-additive/

http://www.marvelmysteryoil.com/products/

I have used MMO to free and prevent sticky valves and used Seafoam to clean cabon deposits and stabilize the alcohol fuel. It also has helped to prevent sticky valves in my Lincoln. I use regular 10% ethanol in my Mercury and add MMO a couple of times a year.

In the hot temps of the southwest, Seafoam might be a good idea to help stabilize the fuel.

Tom

gfstew

02-25-2019 @ 9:29 AM

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OK what is MMO

trjford8

02-25-2019 @ 9:32 AM

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Marvel Mystery Oil and can be purchased at almost any auto parts store.

Drbrown

02-25-2019 @ 9:30 PM

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I remember MMO back in the 50's but never used it. However, when I got my '47 half dozen years ago it came with noisy valves. Seeing its positive reputation on the flathead forums I tried it and it it worked fine .... continue to do so.

supereal

02-28-2019 @ 12:38 PM

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We use the non-ethanol premium gas. It is more expensive than gasohol, but will avoid "phase separation" that happens when the fuel is stored. This allows the fuel to separate into layers, making the often water laced alcohol accumulate where it can enter the system. Here, in the midwest where temperatures vary greatly, the extra cost is worth it. As to Marvel Mystery Oil, unless properly used, sparkplug problems can arise. To me, the "mystery" is why it is still produced.

MGG

02-28-2019 @ 1:49 PM

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I used Marvel Mystery Oil to free-up sticking valves in three engines, 2 v-8s and a Case tractor. The engines had not run for 25-30 years. I am a believer.

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