mates had runner 172 cases flowed today doesnt seem like its running right do i need to adjust the carb?
Any change in the flow characteristics will affect fuelling, without knowing exactly what was done it`s impossible to guess at which way the fuelling has been affected. No disrespect to the builder but first thing to check is the engine has been rebuilt correctly as I assume the cases were split for the flowing and hence a complete engine rebuild has been done. If your satisfied the rebuild is sound and no obvious faults such as air leaks/water leaks into the cylinder/correct squish/ete etc are apparant then you will need to dial in the carb.
