quick question

91dime

Drop & Destroy
Joined
Mar 8, 2007
while tearing my 4.1 down i ran into some things,

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a nice size chunk was gone from this piston


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Is there anything that can cause this or is it just from being ran to hard?

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What is that peice of metal in the water jacket? i figured it was where they injected the metal in the cast.

And im took the deburing bit on the die grinder and the stone and clened the lifter valley anything else i should focus on clening the cast off?
 
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