When assembling the 004 engine, the case stiffness and accuracy was checked. This was done by repeatedly torquing the halves together and checking the bore diameter accuracy in four directions with a .0001" bore gage. They repeated perfectly. It was like night and day compared to the earlier cast cases. Bolt sequence and torquing the cylinders and heads had no affect on the bore accuracy. This case is stiff!
The halves are assembled with 10mm ARP studs and 8mm cap screws; 10 each. There are also 10 hollow pins to insure alignment. The crank and 4 Carrillo rods can be seen. The billet sump is attached to the bottom with (18) 6mm cap screws, 16 of which extend through the caps and anchor in the top case.
Engine assembly was complete by fall 2005.