Indeed..., Offenhauser 4-cylinder engine achieved a maximum output of 1,000 horsepower in its turbocharged variant during the late 1960s.
I wasn’t aware of Offenhauser making engines, I thought they just made high performance parts, not complete engines.
How many cubic inches or litres was the Offy engine?
I know nothing about Offenhauser except they made competitive engines for race cars.