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_28 (bore_ VARCHAR, _stroke VARCHAR, carburetor VARCHAR, vin_code VARCHAR)
### Question:
What are the bore & stroke specifications for an engine with 4-barrel carburetor and VIN code of A?
### Answer:
SELECT bore_ & _stroke FROM table_name_28 WHERE carburetor = "4-barrel" AND vin_code = "a"