SELECT MAX("Taper (in/ft)") FROM table_8658 WHERE "Size" = '8'
What is the highest Taper (in/ft), when Size is 8?
CREATE TABLE table_8658 (
    "Size" real,
    "Lg. Dia." real,
    "Sm. Dia." real,
    "Length" real,
    "Taper (in/ft)" real
)