[CMCamp]

My 1962 K1001 failed a compression test pretty miserably. It has a 305D V6 and here are the readings Cyl 1 = 125, Cyl 2 = 47, Cyl 3 = 135, Cyl 4 = 47, Cyl 5 = 130, Cyl 6 = 100. The heads are off now and it is pretty obvious that I have two burned inlet (yes inlet) valves in 2 and 4 plus damage starting in 6. I'd like to get your opinion on what might have caused this. Several coincidences here: all inlet valves, all on the passenger side head, all damage at the point where the valve edge is closest to the spark plug.

The heads are off now and disassembled. I cleaned the bad valves and the damage is pretty obvious. I attached a picture, but the lighting is not good.

What else should I be checking to possibly prevent this damage in the future. Appreciate your help.