m108

I know from experence a 230 will run with 1 or more valves stuck and the 251 is just a bigger version. I have poured Marvel Mystery oil in them to the point of almost flooding them out when running to un stick them on several engines.On a flat head a stuck valve can't hit any thing and damage it .If it was stuck shut it could possibly damage cam, tappet or valve right off the bat but I haven't seen it on several that have been brought back from the dead.I haven't ever checked the compression on a cold one but they all seem kind of low.I'll try to check mine tomorrow afternoon and let you know.How old is the gas in the tank?

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1953 M108
R2 Crash Truck
1953 M37
1981 W250 4 Door