Rightio, further research by myself and John Mackie has revealed that this engine is one that he didn't know even existed! According to him, the engine is a Chev 224 cubic inch; the piston is a 3 and 9/16 flat-topped piston, for a standard bore, with the Repco parts number "HX 1632", which Repco says did indeed exist, but is not made anymore.
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