What other modifications or machine work is necessary to run these kits on an “RB” (413/426/440) engine?
For an RB engine, some very minor clearancing of the very bottom of the cylinder walls will usually be required. Sometimes you may also need to clearance the inside of the boss where the oil pickup tube screws in. Some blocks have more “meat” in them than others, so exactly how much you will need to clearance will depend on the specific block you are using. The larger the stroke, the “farther” away from the center the rods are going to be positioned, so the stroker kits with larger strokes will generally require slightly more clearancing. Most people who have enough technical skills to assemble an engine can do this clearancing in their garage with a die grinder in less than a couple hours. No actual extra “machine work” is required. Most of our smaller kits (511CI and below) usually will work with stock oil pickups, and stock oil pans. Also, don’t forget you can’t run the stock windage tray, a special stroker windage tray is required.
