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--> Add to Favorites Home About Us Feedback New Arrivals Ending Soon Contact Us --> JE FSR Pistons Brian Crower Ibeam Rods for Impreza Sti EJ255 EJ257 99.75mm 8.5:1 Description These pistons are +0.25mm (or 0.010 inches) over bore. This is often referred to as "Ten Thou Over". Many times when an engine is being rebuilt after a failure, the cylinder walls are slightly damaged, requiring the clinder hole to be bored out. This process removes any surface irregularities from the cylinder wall, expos...

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