Usage:
Exhaust opening (before bottom center) ... 18° 24'
Exhaust closing (before top center) ... 2° 55'
Inlet opening (after top center) ... 1° 14'
Inlet closing (after bottom center) ... 13° 34'
(1) 2S4213 Spring-valve:
Length-test force applied ... 1.95 in.(49,53 mm)
Test force ... 55.0 ± 3.5 lbs.(24,95 ± 1,59 kg)
Free length after test ... 2.31 in.(58,67 mm)
Outside diameter ... 1,486 in.(37,74 mm)
(2) Diameter-stem ... .3717 ± .0003 in.(9,442 ± 0,008 mm)
Clearance-in guide ... .0009 ± .0006 in.(0,023 ± 0,015 mm)
Maximum permissible clearance ... .005 in.(0,127 mm)
(3) Thickness-inlet valve lip (minimum) ... .0995 in.(2,527 mm)
Thickness-exhaust valve lip (minimum) ... .171 in.(4,34 mm)
(4) Angle-inlet valve face ... 44 1/4°
Angle-exhaust valve face ... 19 1/4°
(5) Diameter-inlet valve head ... 1.771 ± .005 in.(44,98 ± 0,127 mm)
Diameter-exhaust valve head ... 1.646 ± .005 in.(41,808 ± 0,127 mm)