Tom,
It is possible to modify a TRW or Sealed Power (they were made from the same piston forging blank) forged piston to accept the locking rings necessary for a full floating piston pin. You would also have to use a shortened pin, or a special order pin, and the connecting rods would have to be modified with a bushing for to allow the full floating set-up.
This is not really necessary for the street if the proper clearances are used during the assembly, and the pin does not fit too tight in the piston boss. There are plusses and minuses for the procedure. The plusses: a little additional insurance against the pin seizing in the piston (if the fit is just a little too snug to start). It is easier to disassemble the piston/rod assembly for periodic teardowns. Negatives: Cost, and you have additional components, which could fail during extended use (the lock rings). The lock rings rarely fail, so that is really a negligible consideration.
Hope this helps.
K.
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K
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