1 SET IC981.085/ 1 SET 4165BD8.045

Icon Forged Pistons are forged from high ductile 2618 alloy. With a 1% silicon content 2618 alloy they are formulated and heat treated for the most demanding performance applications such as very high compression ratios, boosted application and nitrous. Crown and valve reliefs are cnc machined, Top land mini groove technology, Skirts machined by UEM's unique in house built cnc machines, Accumulator groove to help eliminate flutter and maximize ring seal, Skirt and pin boss struts designed to withstand heavy loads from high cylinder pressures, Wrist pins and spiral lock rings included. 1/16 1/16 3/16 rings not included. Compression Ratio 72cc 9.5:1 and 87cc 8.5:1. Advertised piston weight 549 grams, 158 gram wrist pin. OE Deck Height 10.250". Note: Standard bore size is 4.125". Notes: Pin is Centered. Uses BBC wrist pin diameter. Standard bore based off 4.125" - 030" will net 4.155" bore. Use Eagle 6.635 Chevy Rod.