Bronze aluminum qq-b-666, 4.988 in. O/a lg, 3.893 in. Min to 3.895 in. Max od, 3.377 in. Min to 3.379 in. Max diameter bore thru, cam tip to cam base 2.576 in. O/a, machined surfaces 20.0 40.0 and 100.0 microinch finish, 4 keyways 0.250 in. W 0.093 in. Min to 0.098 in. Max dp