Could dust accumulation around firewall on the last 2 cylinder area
at high rpm caused severe sand blasting and friction melt?
Thats if you had no filtration of course.
If you had $700 from an uncles engagement present you could go full offset
81mm sleeves, stock 4age or 7afe pistons 81x77 = 1587cc better freeway revs
than 82mm stroke.