Head Stud Kits — studs, nuts, and washers; Block Kit — core plugs, dowel pins, etc. Ductile Iron Sleeves; Main Caps with studs, nuts and washers; High Cam blocks raise the cam 0.400″ on RC 600 to allow for stroker cranks. Special cam bore sizes are available upon request. Deck Heights on D500 and RC 600 can range from 9.800″ – 10.300″.