About 2-years ago, we built a 1968 '273 Marine' for a customer, and he had
a set of 'factory' 1968 +.040" over 'Flat-Top' Pistons w/notches.
He got them from some old Marine Boat Shop in Michigan, and they were
much taller than the 1967 Pistons.
Without decking the block, they sat {-.015"} down the cylinder bore.
Original factory replacement cast Pistons. Not sure how long they were sitting
on the shelf, but the box was old.
