I've always thought and still believe the stock lt1 pistons were of hypertectic construction. Ive done some research on the net and confirmed this. My engine builder that put my short block together keeps telling me that I should have just re-ringed the block instead of putting new pistons in, because the stock pistons were forged, and so he says I wasted money by getting new forged pistons (which looked like jewels when I first opened them) Instead of letting his shop get ahold of some new stock pistons. What you guys think? The whole basis for this rebuid was to have a strong bottom end that could support some spray a lil better than a stocker.

 

Stock LT1 pistons are hypereutectic, no doubt about it.

 

his reasoning was 'because the stock pistons are heavier than the replacements, the stock ones must be forged'.

 

That's a stupid basis to go on. I wouldn't have let him build my engine.

 

They are hypereutectic, made by Mahle in Brazil.