• Improved Crankcase has reinforced cylinder decks, balanced oil system and thrust face lubrication.
Superior's crankcase is made from aerospace grade AA C355-T71 stabilized structural aluminum alloy per AMS 4214. The reinforced crankcase cylinder deck greatly reduces deck-to-deck cracking. Unlike competitive crankcases, Superior's balanced oil system lubricates the crankshaft and camshaft from either side of the crankcase. This reduces oil pressure fluctuations and equalizes oil flow through the entire engine, including the lifters. Pressurized oil lubricates the crankcase thrust face, reducing friction on the loaded surface of the case where the crank pulls the case forward. These features are only found with a new Superior crankcase.