Enzo,
No need to take the head off. If you are getting persistent high temp problems, have a garage flush the engine block & radiator. At the website I mentioned you can find some pictures ("Horror Stories") showing what you can find inside the rad and block. Enjoy!
Less likely cause is a collapesed coolant hose, but worth checking anyway.
Re split rims - I gave up the idea as they are impossible to balance, hence useful only at low speeds.
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Roman (UK)
www.overlandcruiser.info
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Roman (UK)
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