It was pretty darn good, but there isn't any real engines now.
Viewing post in 1967 Allis Chalmers D17 comments
The reason the power got increased so high is so you can actually use the tractors with about 85% of equipment that most farmers use now days. To many mis matched power requirements on attachments these days. So without the extra power most old school / old iron tractors are useless for most farm tasks Unless you increase the power. Giants engine only can do so much sadly.