Blow By

Well, my 65 Valiant wagon had bad blow by,it got so bad I had to keep the windows open and hook a vent hose from the oil fill cap to the air cleaner just to drive.The day before I pulled the motor to put in a known good one I had it on the interstate going 70 mph. She ran like a top. After I pulled it I tore it down to see what was causing it. Results : #1 cylinder has the top edge of the piston melted away and 2 broken rings , on 4 of the other cylinders I found broken rings as well. The thing just wore out ! She had 350,000 miles on her and still ran like a top with all this going on inside. This is how strong these things are ! You'll probably find similar stuff inside your motor if it has high miles as I suspect it does.