The mgb has quite a few drainage points that drains water that collects from the inside (especially the open top version) and from the sills and floor box sections.
These can easily get blocked with underseal and other debris.
information about the MGB and MGB GT classic cars including news and reviews, techs and specs – also updates on repairs, servicing and diy modifications I do on my own MGB Roadster. I am no expert on these cars – just a keen enthusiast – but I hope these posts will be of interest to others with a similar interest
MGB tips mods and maintenance 