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polished piston tops??

1K views 2 replies 3 participants last post by  turbo2256b 
#1 ·
most pistons i have seen have a dull coat finish to the top of them. i would imagine its just the cast pores. some however have a clean machined look and almost seems polished. is there any difference in performance between polished and cast pistons? quenching? less chance for carbon to stick?
 
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