Bought a 60 HP 1991 Johnson that need to be overhauled. I am told the only
difference in a 60HP and a 70HP is the cylinder head. Is this a different
head, or is there more compression in the 70? Also I see the pee spout is
in the bottom cylinder and I think I read where there was a modification
with a water pump upgrade, to the top of the motor? Any one have any
information?