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Stuck valves

My Model A coupe has the original four banger engine and every intake valve was stuck due to build up of carbon and varnish. i spent the day pullin the head and scrubing the ports and valve to get rid of it but for future reference does any one know of a safe additive i can put in the fuel and or oil to clean the valves out a little so i dont have to buy new gaskets and work at it so much?
 

john112deere

caffeine junkie
Staff member
10,807
405
central Vermont
I know my friend puts a bit of Marvel Mystery Oil in the gas in his A (and also his '25 Dodge) at every fill up.

*I'll say I've heard some horror stories about MMO, too, but I'm pretty sure they were all guys who tried it in the crankcase, not in the gas.
 

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