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I have been calling Cosworth all this week not to much avail, but am keeping on at them.
It seems early pistons had a central dish and two very deep depressions for the valves, later pistons only had a central depression. The later heads had a angled inlet port to promote swirl, as well as smaller exhaust ports.
Re the dates, I assumed 19645 was a late 1964 engine?
It has a cam box with provision at the rear to drive the injection pump, as per Cosworth photos of the engine fitted into a Brabham and raced by Costin in the 1965 Senior Service 200 Race.
Talking to Mike Costin in Nov last year he said that the engine needed too much ign advance to be efficient.
Kevin Whittle
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