I’ve just had a phone call from the engineer doing my engine overhaul. He’s sent the Morgo 750 barrels away to be honed to see if the original standard pistons can be reused, and no they can’t. It needs a first oversize rebore and pistons +20thou. One of the old pistons is also distorted as well.
Morgo don’t have any pistons apart from std.
However, he’s found a set of +20s in Germany.
I’ve had a look on their website and they’ve got quite a good selection of stuff, so I’ve bookmarked them for future reference.