I'm not sure that there is any need to differentiate between the records set in cars that were construscted to Kent regulations and those that are converted Zetec (and potentially Duratech) spec. My reasoning of this is that in the era of the Kent engine being used at a national level, there were a significant number of enhancements to chassis design (I'm sure most people would agree that in most circumstances, say, a Swift SC92 is quicker than a Jamun T2, for instance). As such the introduction of new cars can be seen as an extension of this progression. The key thing to my mind, is that the records are set in FF1600 races, by cars complying to the prescribed regulations, regardless of age.
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