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Engine cases are all new construction. All cases are made from high quality aluminum and are fully cnc machined. This is a great replacement stock case with 8mm inserts. - 90.5 & 92mm Bore - Bubble top raised roof design for stroker clearancing - Universal Dual-Bypass design - Reinforced/Filled area behind #3 cylinder - Reinforced head stud area - Drilled and tapped for full flow w/plug - Main Oil Gallery tapped for ease of cleaning - Grooved cam plug. - Cases Weigh Roughly 42 LB - Shuffle Pins on all Main Saddles - Clearanced for 86mm Stroke Crank Note: Modification to fan shroud needed Material: Aluminum Bore Size: 90.5 & 92mm Stud Size: 8mmEngine Case Aluminum 90.5 & 92mm Bore For 8mm Studs