1.6880" bore diameter eight additional holes 0.250-28 unf-2BX0.625 in. min dp on 2.500 in. bolt circle; id cbore 2.00 in. min to 2.003 in. max; one end of flange internally threaded 0.250-28 unf-2bx 0.25 in. min dp 0.187 in. thru
2.3750" bore diameter 4.5000" housing length bore is counterbore to 3.374 in. nom dia; 6 additional holes 0.687 in. nom dia equally spaced paint excluding bore or aperture surface treated flange block