seafoam in flatheads ?

No opinion on if it works but be sure to use it outside. Not in enclosed spaces. Huge clouds out the exhaust from what I recall seeing someone else use it.
 
I have been using it for the gasoline in my '37. No problems with it at all, and it seems to help keep the gas from going bad.
 
I use it all the time with no issues. I drive my '36 all the time and run Seafoam every so often to keep the 97 from gumming up.

H36
 
I have used it successfully in two of my old tractors to help mitigate carburetor problems caused by ethanol gas and long periods of inactivity. I do not now use ethanol gas in any of my engines except for the car and pickup.
 
I've been using Sea Foam, in all my vehicles, for a good number of years. It does keep the fuel systems clean in both carburetor and fuel injected vehicles. As with other additives like MMO, you'll find both pros and cons offered up. My advice, (should you choose to take it), is to try Sea Foam for yourself, and evaluate the results you get.
 
We used to call it "Mechanic in a Can". Seriously, I fill my tanks and add a can of SeaFoam every fall when I put my cars away. I've never had a problem come spring (we do have easily attainable non-ethanol gas here). I usually add another can in the early summer. It's getting expensive lately. The last I bought was at Fleet Farm for about $9 a can on special; used to be a couple of bucks, IIRC.
 
I use in every gasoline engine I own that has sat or will sit for any length of time. It works for me......MARK
 
I swear by it. I always use it when going on a tour. After about 40 miles
cars smooths out and operates with very light throttle . Just like driving
with a tail wind.
 
Used it both in oil and gas on a motor that hasn't been started in years! I also poured it directly into the carb while running the motor. Worked great but did make a lot of smoke.
 
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