Anyone who remembers my other threads, Stuck Valve or Removing Heads may remember that I have just pulled a head from my 350 SBC, to find that one exhaust valve was stuck open and had been hitting the piston. I had that head overhauled by a machine shop, and a new valve put in.
Today I have just pulled the other side, and although the valves aren't stuck open like before, mark on the pistons show that two of this sides valves have also been hitting.
Can anyone suggest why this maybe? Could it been explained by valve float?