After the crank has been positioned into the block, the main caps can be installed. Numbers and arrows cast into the caps tell you where they go. The arrows should point toward the front of the motor, and the caps are numbered 1-5, from front to back. It’s best to seat the caps onto the block with a mallet instead of forcing them down with bolts, since the latter can crack the cap. With four-bolt caps, the inner bolts should be torqued down first, followed by the outer bolts.