How much horsepower does a 351 Windsor motor have?

When its production ceased in 2001, the Ford 351 Windsor engine produced 240 horsepower at 4,000 revolutions per minute (R.P.M.). Ford Racing then began to produce a racing 351 Windsor engine which has an output of up to 535 horsepower.

The 351 Windsor has long been an engine appreciated by enthusiasts for both racing and street cars. In 2006, an enthusiast re-engineered and rebuilt a Windsor 351 to produce 816 horsepower. This was achieved without adding fuel injection, turbo charging or super charging. The name "Windsor" comes from the Ford engine plant in Windsor, Ontario, where the engine was produced between 1962 and 1969, the year in which production was moved to Cleveland, OH.