Thanks for the information John
I have two cars one is an everyday car and the other I am building is a track car.
I have taken the plunge and ordered an alloy rad from Grp4, so will probably need the bushes you are talking about.
Going back to the orginal problem of cooling. I have had the rad flushed, I am using new clean coolant that I change each month, the timing is around 10 degrees (8 degrees was causing run on when stopping engine), a new thermostat. I have a 87 degree fan switch, running a 14inch blow type fan fitted to the front of the rad (it is so big it fills the whole rad area). The rad has the required 10 - 12 degree drop in it from top to bottom.
The reason why I think I have a problem is I have two sensors, one is the standard one that goes to the dash, and goes and stays between cold and running temp and the other is a sensor fitted into the block drain (rhs) and reads around 93 degrees (although this one will creep up to 100 when on the track). when you run down the road the top goes up OK but then stays at the temps mentioned, I would have thought if travelling on the freeway (with the fans on) the temp should come down quite a bit. Would the larger alloy rad solve this problem ie more coolant and bigger cooling area?
Sorry about the long windedness of this reply
Rod