Features & Benefits Available 114 M8 models Available in both highlighted and non highlighted versions 114 to 128" big bore kit Wrinkle black finish Highlighted Fins Bolt on kit. No Machining Required includes gaskets and hardware required for installation 4.250" bore Forged Pistons 11:1 compression ratio ***We recommend using S&S Cycle Head Bolts for M8, part number 900-1006 for all big bore applications.