It is possible to get the Pistons out to hone the bores and replace the rings with the engine still in the car but the head obviously has to come off.
£6400 for a set of Cosworth pistons and a rebore sounds absolutely crazy money to me, how much are the pistons and the rings?
If the pistons were left in place one would hope excessive wear was not an issues but if the bores were glazed that would not help especially if you have stuck worn or broken rings.
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