Thanks Jeremy and HNY back at ya. I well appreciate the approach suggested but I'm clear on how I'd want the bare head to fettle a touch here and there. I had lunch yesterday with a mate who's had long years in the trade, working along the way on the likes of Alfa, Ferrari, BMW, American of all sorts and he advises it's unnecessary for the head to be heated for extraction. Quite onside with heating, plus freezing the guides for reassembly though.
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Cheers
