This idea may be nauseating to some of the dyed in the wool British acr owners, but the best modification I had done on my 1957 MGA was to have the radiator filler neck changed at a radiator repair shop. There are two sealing rings in a radiator neck, the distance between the British seals is 1", and the American distance is 3/4". By changing to the 3/4" size, I am now able to use the siphon-style radiatorcap and overflow bottle. Now when the coolant expands it raises the cap, flows to the bottle and returns back to the rad when cool, without loss of coolant.
Also, the rad can be pressure tested with a regular tester.
Bernard Allison
Huntington Park, Ca.
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