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_71 (engine_s_ VARCHAR, chassis VARCHAR, year VARCHAR)
### Question:
What is the engine(s) on the car before 1978 with ensign n177 chassis?
### Answer:
SELECT engine_s_ FROM table_name_71 WHERE chassis = "ensign n177" AND year < 1978