Minis (unlike Fords etc) already have forged rods and forged cranks. Never had cast ones.
Yes you can get forged pistons (from UK or US) for a price, but they are not the best for road cars- they expand much more and need bigger bore clearance. May be worth getting for turbos though I guess... if you got the do$h.
For most purposes, even racing, modern cast ones are fine. See the thread on Graham Russell pistons, Hypatecs are good too.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
