Gotta chime in too. I didn't start spraying mine till 125,000 and when I tore it down at 160,000 it still looked brand new inside. I didn't even do the bottom end. It still had good compression and oil pressure so I started bolting stuff on. At 170,000 now and it is still strong! I used the zex dry kit and loved it. I only sold it to start the bank for a 331 stroker to bolt all of my new parts on. Highly recommended!