Sport water loss problem sorted(ish).
Borrowed a super bit of kit which fits on the rad filler and is pressurised. Initially nothing seen with engine not turning.
Started up and water pressure rose to 11psi and stayed there but when really warm water started dripping quite heavily from around the back of the water pump somewhere so looks like a new short hose and perhaps Barleaks. ?take off waterpump and overhaul.
I sort of had hoped it was a head gasket as I am putting on new heads with new valve guides and valves to stop my smoking exhaust!
I haven't looked at workshop manual yet but I would guess radiator out is best for access.
I reckon I lose about a pint per 100mls.
Brian
I have heard that 2000 heads fit and give an instant increase in power, due to the bigger valves. If I had an 1800, that's what I would do! Regards, John