Well, after 4 years my motor cracked a piston a couple days ago. Motor has crower rods, cut uncoated lb7 pistons, valve springs, and head studs. Counted 257 time slips below 11.2. Over half of those were in the 10's. Weight of the truck typically was around 7300 with me in it. Odd time I pulled seats and hitch, but never really made a difference. Trying to decide what to change if anything this time around.