You are not allowed to modify in ANY way
It must have the laser cut marks, burr and burn marks
Apparently One of the big motor builders had to change there restrictors because they was not "as supplied" at a recent large meeting
The restrictors all seem to measure 15.85 or very close if one measures 15.99 it will ring alarm bells
You can see the laser marks on the bore, if you cannot its illegal I have been told more than once now
They measure with a vernier. Which is ok but not great at measuring bores, you need a bore mic, or go / no go gauges to be correct
Perhaps we should have "pooled" restrictors to stop the dads playing with them (and other things)
:)
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