If the knock stops when you pull the plug wire it is your rod bearing that's shot. You have to pull the engine for major surgery. I too am in the same process. If it were the head you would not be getting a good valve seal or would hit the piston causing obvious damage and noises (if it would run at all).
Rebuilt engines are available but they are pricey ($9k -$11k). Check the internet for info
Rebuilt engines are available but they are pricey ($9k -$11k). Check the internet for info
