Auto Racing: 6hp, briggs and straton, peak horse power

Question
Hi, how many cc's is in 6hp(horse power)?

Answer
Ryan,
that is not a straight forward question as hp varies with rpm and engine design.
But, a quick search on Briggs and Straton Engines gives us the data on a 5.5 hp engine as:
Displacement 11.57 cu. in. or 190cc. that hp rating is typically Peak horse power.