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I am taking apart a 289 shortblock I got at a swap meet and after yanking the pistons I was curious to see if they were forged or not. the only numbers I could find on them were the 40 marked on the top (overbore I know) and 772AP marked on the skirts on the inside. I wanted to see if they were worth keeping, or if they were just stockers.
 

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I am taking apart a 289 shortblock I got at a swap meet and after yanking the pistons I was curious to see if they were forged or not. the only numbers I could find on them were the 40 marked on the top (overbore I know) and 772AP marked on the skirts on the inside. I wanted to see if they were worth keeping, or if they were just stockers.
most likely a cast piston .
are they in good shape ? you know how to tell if a piston is still serviceable
 

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most likely a cast piston .
are they in good shape ? you know how to tell if a piston is still serviceable
They appear to be in good shape. I had to hammer out one piston, rusted in place. There was very slight damage done to the top. Compared them to forged units I had in my house and confirmed they are cast units.

Skirts, ring lands, and bearings and all other parts appear to have reasonable wear.

Still interested to see if they are 9.0-1 or better pistons.
 

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Along with the block.
 
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