I have a Mk1 Spitfire with a Mk3 engine which ran very hot when I got it. I fitted radiator valances, the wider radiator, 7 blade mechanical fan and fresh coolant. No electric fan or engine bay valances and I have standard air filters. The car now runs a bit cold - just sits at the bottom of Normal even in traffic. Temp gauge doesn't get anywhere near halfway. I am now fitting a new thermostat as I suspect the previous owner tampered with it to try and keep it from overheating. I would like a bit more heat in the engine and in the cockpit!
I think the condition and age of the radiator and the coolant have a lot more bearing in engine temperature than any other component or modification.
I am new to TSSC and have picked up a lot of good tips from this forum - so thanks to everybody.
Cheers,
Roy