Craig de Stigter <craig(dot)destigter(at)koordinates(dot)com> writes:
> Does anyone have any idea why these numbers would be 4 times as big in
> Postgres 8.3.7 ?
It still doesn't make any sense to me that you're getting values larger
than the BLCKSZ. If you look into where that's coming from you might
get a clue what's up with the version difference.
regards, tom lane