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

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02-24-2019 @ 7:17 PM
Posts: 40
Joined: Aug 2018
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 ??

02-25-2019 @ 12:09 AM
Posts: 2291
Joined: Oct 2009
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.


ken ct.
02-25-2019 @ 5:47 AM
Posts: 1370
Joined: Jan 2010
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.

02-25-2019 @ 7:14 AM
Posts: 472
Joined: Nov 2013
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

02-25-2019 @ 7:58 AM
Posts: 5675
Joined: Oct 2009
here is what the manufacturers say about their additives




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.


02-25-2019 @ 9:29 AM
Posts: 40
Joined: Aug 2018
OK what is MMO

02-25-2019 @ 9:32 AM
Posts: 3278
Joined: Oct 2009
Marvel Mystery Oil and can be purchased at almost any auto parts store.

02-25-2019 @ 9:30 PM
Posts: 472
Joined: Nov 2013
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.

02-28-2019 @ 12:38 PM
Posts: 6501
Joined: Oct 2009
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.

02-28-2019 @ 1:49 PM
Posts: 75
Joined: Jul 2014
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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