Stock btm end
 

Anyone have a general idea how many miles the stock bottom end is good for?

On which engine?

well the 3800 bottom ends are good for 200k-700k depending on driving habit, and coolant exposure from gasket failures, and the oil used. this is assuming a stock engine, a modified 3800 can last just as long but will require more strict attention to detail with maintenance/preventative maintenance.

Thanks, exactly what i wanted to know.