I've found a HRC cylinder head conversion kit (inlc. waterhose).
The head has 'H' stamped on it.
Does this signify its a SE/SP head or an 'R' head?
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30