Piston weight?

Captainkirk said

Question for all you professional engine builders out there:
When building a Mopar performance smallblock (340), what should the max allowable weight variance between pistons be? (in grams)

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Generally,

Custom Pistons will come in at {+ or - 2.5 Grams}, one way or another.

In other words, they can be {5 Grams} off from one piston to another.

For a Street Performance Engine, those weight differences are acceptable.

The 'old' {Heavy-Bastard} TRW Power-Forged Pistons, can be off as much
as 7 Grams.

As a general rule, for high-revving Street Performance Engines, after
'Balancing', a {2 Gram} variance is acceptable.