Usage:
(1) Bore-valve guide ... .3726 ± .0003 in.(10,464 ± 0,020 mm)
(2) Length-guide ... 2.872 in.(72,95 mm)
(3) Bore depth in head for insert ... .474 ± .001 in.(12,039 ± 0,025 mm)
(4) Diameter-bore in head for insert (inlet) ... 1.8090 ± .0005 in.(46,049 ± 0,0127 mm)
Diameter-insert (inlet) ... 1.8120 ± .0005 in.(46,025 ± 0,0127 mm)
Diameter-bore in head for insert (exhaust) ... 1.6840 ± .0005 in.(42,774 ± 0,0127 mm)
Diameter-insert (exhaust) ... 1.6870 ± .0005 in.(42,850 ± 0,0127 mm)
(5) Width-valve seat (inlet) ... .110 in.(2,79 mm)
Width-valve seat (exhaust) ... .107 in.(2,71 mm)
(6) Angle-inlet valve seat ... 45°
Angle-exhaust valve seat ... 20°
(7) Diameter-valve seat:
Inlet seat minimum permissible ... 1.714 in.(43,54 mm)
Inlet seat maximum permissible ... 1.7456 in.(44,34 mm)
Exhaust seat minimum permissible ... 1.589 in.(40,36 mm)
Exhaust seat maximum permissible ... 1.6210 in.(40,40 mm)