We may have found other answers which could help you.
Click here for Valves Briggs StrattonBriggs and Stratton SP470?
How to fix a problem with briggs&stratton hp407engine?
Briggs and Straton Motors?
Excessive Compression?
Just overhauled 16 hp Briggs ans Stratton engine ?
my briggs and stratton 3.5hp starts up then cuts out straight away?