Engine Case by Ultima, Evolution Style 1992 & Later, 3.500" Bore, Black Finish All case kits come with the main bearings, cam bearing, chromoly cylinder studs installed and the pinion race sized to 1.751. Also included are the main seal, main seal spacer, top end feed screen and spring, chrome timing hole plug, stainless steel case bolts and the oil pressure gauge. Machining is done on our state of the art CNC machining center in Pevely, Missouri, using hydraulic fixturing for repeatability with strict QS and ISO quality standards enforced. Features cast-in high carbon steel inserts, counter bored allen case bolts, large 1/4 NPT drain plug, and a high volume ported breather, making these a professional engine builders choice for your next high performance engine. produced from prime C355-T6 which is a commonly used military alloy and known for its stability over multiple heat cycles.