Hmm good point/question here.
The fundamentalists at the FIA will say that in the case of many cars because they did not run an overbore in period-there being no need on a brand new engine- that there is no overbore permitted.
I know for a fact that a recent FJ application with a FIAT engine over bored within the limits of the rules and the class was refused on the above grounds.The fact that the block is 50 years old and irreplaceable was not considered as factor
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