2t, 2tg, 3t, 3tg etc all have different pistons
2t and 3t are off the shelf for bursons sorta items (main difference is the pin height)
But for a twin cam have about 2mm bigger valves stock so you need to have the valve recesses cut out
For a 3TG you will want 3T pistons (different pin height) with valve recesses cut out
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