1) Bolt down main cradle without crankshaft and tension main bolts to specification. Important Notes: You should use the actual bolts that will be used in your build. They must be torqued to their correct specifications. Please ensure your OEM Main cap girdle is centered, this is usually done with a rubber mallet on the 4 pointy corners of the girdles reinforcement. If installing aftermarket main studs, there may be 3 studs that require shortening as they will protrude into the machined surface. We recommend machine down the seats of these nut seats to ensure all the studs are equal 4.4 inch lengths.
2) Prepare RB25 / 26 engine block on mill and set level along sump pan reference to ensure main bearing cradle is machined parallel to sump mounting surface. Mill material off the installed cradle to precisely 22.5 mm above block deck height (i.e. sump pan face)(Please measure this with your own equipment to ensure uniformed result) allow 1 thou clearance on block pan surface to allow for sealant if possible. This will provide a machined face on each of the seven main bearing caps. Important Note: Please ensure you check your installation height and zero your own measuring equipment before machining.