How many horsepower does a 350 bored 60 and 993 heads?

The horsepower of a 350 cubic inch engine bored 0.060 inches over (which increases its displacement) and equipped with 993 cylinder heads can vary significantly based on other factors such as the camshaft, intake, exhaust, and tuning. Generally, a well-built 350 with these specifications can produce anywhere from 300 to 400 horsepower. For a more accurate estimate, it's essential to consider the specific components and setup used in the build.