A ticking progressed to a knocking my final trip of last summer.sounds like front end of the left side case.

It seems worse this year gettin her out n drivin her around, more like a small hammer on the case. sort of

Engine is out, muffler is off and shielding is removed

the left side head is coming off, i dont see cracks around the valves, they all seem to be seated ok

im guessing its a bad main bearing

What should i be looking for?
Am i going to have to crack the case to find the contact area if it is a bad bearing??