Which engine is responsible for the USAC Championship Car?
CREATE TABLE table_name_72 (engine VARCHAR, series VARCHAR)
SELECT engine FROM table_name_72 WHERE series = "usac championship car"
### Context: CREATE TABLE table_name_72 (engine VARCHAR, series VARCHAR) ### Question: Which engine is responsible for the USAC Championship Car? ### Answer: SELECT engine FROM table_name_72 WHERE series = "usac championship car"