The athletes of the Cambridge women's Blue Boat weighed-in at an average 75.6kg per at the River and Rowing Museum this morning, with Oxford at an average of 69.2kg, some 6.4kg (14 lbs) lighter.
But the record weight difference - the largest since the start of the official Weigh-In in 2001 - is unlikely to worry Oxford, who will know that, unlike the men's race between Putney and Mortlake, weight is not necessarily the deciding factor.
The heavier crew wins the men's heavyweights race twice in every three encounters, but in the women's race it's the lighter crew which has the advantage, at least on paper. And with honours even over the last four years, supporters are looking forward to another keenly-fought contest on Sunday.
In the reserves race Blondie, for Cambridge, established another crew record at 75.6kg per athlete, some 2.7kg average heavier than Oxford, who have had a consistent run of success in the reserves contest over the last few years.
The lightweight crews will weigh-in on Race Day itself, with the men needing to weigh less than 72.5kg, and the women less than 59.0kg.
The weather for the remainder of Race Week is set fair, and as the river banks dry out after the winter rain the forecast indicates that the largest crowds for many years can be expected on the towpath.