Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT bore_ & _stroke FROM table_name_28 WHERE carburetor = "4-barrel" AND vin_code = "a"