Hello again.
Whiles i Had the engine and box out (rover 3.5) i decided to treat him to a new water pump (short nose version)

When i came to fitting, I'd forgotten that when i built the engine years ago, i'd used a 12 vane water pump.
However I seem to have ordered a 6 vane pump instead

So, do we know if the 12 vane does provide better flow, or the 6 vane pushes a larger volume each rotation please?

in summary -

Rover V8 3.5 with big valve heads 6 or 12 vane water pump best?

Cheers again