gday people ive got a question to pick ya brains if this makes sence

when i got my engine rebiult i got my bores bored out by 20 thou and the pistons i used where je forged pistons pn (p226378je).
i called je for the clearance between piston and bore and they said between 0035-0040 thou. what is happening is when i exellerate fast it blown blue smoke is that normal for forged pistons.
sorry if its hard to understand
any help would be apreciated

cheers

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GREEN MY99 WRX WITH IHI VF30