| I need to correct something in my above post, I do not want to edit it as the post itself has been somewhat controversial and to "edit" it would not make it clear what part had been edited.
I used a loose term to describe the bore of the 620 as a “loophole” in our rules. The reality as explained to me by the racing committee is that the option to overbore a 620 was left in the original rules as it was considered that a 583 with a bore kit, short carbs and inlets might have the legs on a standard 620. We became aware that one dealer was developing a big bore-kit for the 620 so that dealer was asked by way of a gentleman’s agreement to not pursue it until we knew how the bored 583 would run with the 620.
I apologies to Neil of Sigma if I misrepresented you, it was unintentional. | 
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