i think i cannot win... but my blazer is having first model 6.2 n/a thingy... i cannot be sure about miles and i have changed heads and some other parts in it... Engine is from some pickup or van... those are mostly driven atleast 280-300 000 miles before somebody even thinks tearing it apart... and thinking to fit engine from it to some other truck... my blaze got its heart transplant about 10-15 years ago... also i bet it been running atleast 10 000 every year more... so i think 400 000 it not even far from true... truck is been orginally 350+350 and have been running some good miles already with original setup.. i change old speedo/odometer 2 years ago... old one had worn wormgear tooths out...

tell me if i write something wrongly...