Still positive there is a bleed point at the rear of the motor.
anyway where you up to now, have you remove all air,
Id have a serious look at those Hpd water pumps like BA
installed, not as good as a John Bennet number but very impressive
They have to improve water flow by at least 40%
Need that sauce for some Pasta en forno, one of the joys
of marrying an Italian lol