Crack repair?

THEY'LL NEVER STOP ME NOW!!!! LOL YR, you should have joined us last January in ID... -20 to -40 all week! It was great!

Back to the question of crack depth if I dare.....do the cracks in this spot go as far as into the water jacket? A new seat would not fix that....
Actually wouldn't we like the question asked and Post 31 answered?