I have less than 300 miles on a rebuilt 272. (55 Ford Country Sedan wagon) I took it out last Sunday. Everything seemed fine until I ran her up to about 55mph on the freeway. (I've driven it on the freeway before) All of a sudden, I heard this knocking and stuttering as if one of the sparkplug wires came off. I immediately got off and nursed it back to my garage, experiencing this problem all the way. I could feel thumping coming up through the carb. It increased with the speed.The wires were all on. A friend thought it might be a stuck valve. I shudder to think it's anything serious. Any thoughts? I'm not really a mechanic, but I know which end of a wrench to use.

"You can lead a horse to water...but a pencil must be lead."

 

Cleveland, Ohio