Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_8 (bore VARCHAR, cyl VARCHAR, name VARCHAR)
### Question:
What is the bore for a 9-cyl radial on a 9 AD?
### Answer:
SELECT bore FROM table_name_8 WHERE cyl = "9-cyl radial" AND name = "9 ad"