Fuel for 1951 239 flathead
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Mountain Pass
Joined: Oct 2019
Posts: 196
Likes: 6
From: British Columbia
Fuel for 1951 239 flathead
I am close to starting up a rebuilt 239 flathead. Engine is stock, apart for dual carb setup. I know these were in the day of leaded fuel Can anyone tell me what fuel to use, or what additives i need to add....
Parts Nerd Extraordinaire
Joined: Sep 2010
Posts: 4,369
Likes: 1,786
From: Western NY
As I know mine are fashioned with hardened valve seats, I just run the 87 with up to 10% ethanol readily available, no fuel additives.
One can always run Lucas Fuel Treatment as a lead replacement/substitute if one chooses.
One can always run Lucas Fuel Treatment as a lead replacement/substitute if one chooses.
Fleet Owner
Joined: Dec 2000
Posts: 25,383
Likes: 5,388
From: Central PA
Just use regular fuel. Of you are concerned about the effects of ethanol you may want to use an additive. But many say it's not needed. I do not add anything to my 54 Yblock gas.
As far as lead, experts say you don't need lead unless you're pulling heavy loads everyday or are racing. I did put different heads on my 54 with hardened seats. I'm not an expert on flatheads but I remember reading that some years of flatheads had hardened seats.
I would fill up with ethanol free gas before you store the truck for the winter or at least put in a good stabilizer .
As far as lead, experts say you don't need lead unless you're pulling heavy loads everyday or are racing. I did put different heads on my 54 with hardened seats. I'm not an expert on flatheads but I remember reading that some years of flatheads had hardened seats.
I would fill up with ethanol free gas before you store the truck for the winter or at least put in a good stabilizer .
Fleet Owner
Joined: Jul 2004
Posts: 27,295
Likes: 1,056
From: NM
A '51 would not have come from the factory with hardened seats, instead it would have RotaMatic valve assemblies that spin the valves to even out wear. Not as good as hardened seats, but good enough for most use. I'd say to use non-ethanol gas if you can, but at today's prices.... Yikes!
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Mountain Pass
Joined: Oct 2019
Posts: 196
Likes: 6
From: British Columbia
Ok thanks everyone. Ethanol free it is. Have to take a second mortgage out if I plan on driving it a lot. Our only ethanol free up here in canad is the 94 octane At chevron.
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