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_51 (horsepowers INTEGER, year VARCHAR, tonnage VARCHAR)
### Question:
How many Horsepowers have a Year smaller than 1974, and a Tonnage of 4437?
### Answer:
SELECT SUM(horsepowers) FROM table_name_51 WHERE year < 1974 AND tonnage = 4437