TECHNICAL DATA-B.7 Exhaust Valves Valve Stem Dia.   . ...... ...... ...... ...... 0.372/0.373 in (9,45/9,47 mm) Clearance Fit of Valve in Head     ...... ...... ...... 0.00125/0.00325 in (0,03/0,08 mm) Valve Head Dia. ...... ...... ...... ...... 1.438/1.442 in (36,54/36,64 mm) Valve Face Angle. ...... ...... ...... ...... 45 Valve Head Depth below Cylinder Heal Face (prior to Eng.  Nos.  236U135765 or 236U147150L)    0.029/0.039 in (0,74/0,99 mm) Valve Head Depth below Cylinder Head Face (commencing.Engine  Nos.  236U135765 or 236U147150L) ...... ...... ...... ...... 0.042/0.052 in (1,07/1,32 mm) Valve Head Depth below Cylinder Head Face (all types) Service*   ...... ...... ...... ...... 0.055 in (1,40 mm) maximum Overall Length of Valve ...... ...... ...... 4.847/4.862 in (123,11/123,49 mm) Service Valve Stem Oversizes     ...... ...... ...... 0.003, 0.015 and 0.030 in (0,08, 0,38 and 0,76 mm) Sealing Arrangement ...... ...... ...... Rubber Deflectors *Where   engines   conform   to   the   BSAU141a   1971   regulations,   then   the   valve   depth   production   limits   should   not   be exceeded. Inlet Valves Valve Stem Dia.   ...... ...... ...... ...... 0.3725/0.3735 in (9,46/9,48 mm) Clearance Fit of Valve in Head     ...... ...... ...... 0.00075/0.00275 in (0,02/0,07 mm) Valve Head Dia. ...... ...... ...... ...... 1.742/1.746 in (44,25/44,36 mm) Valve Face Angle. ...... ...... ...... ...... 45° Valve Head Depth below Cylinder Head Face ...... 0.035/0.045 in (0.89'1,14 mm) Valve Head Depth below Cylinder Head Face - Service*    ...... ...... ...... ...... ...... 0.061 in (1,55 mm) Overall Length of Valve  , ...... ...... ...... 4.831/4.846 in (122,71/123,09 mm) Service Valve Stem Oversizes ...... ...... ...... 0.003, 0.015 and 0.030 in (0.08.  0.38 and 0.76 mm) 'Where engines conform to the BSAU141a 1971 regulations,  then the valve depth production limits should not be exceeded. Inner Valve Springs Fitted Length ...... ...... ...... ...... 1.5625 in (39,7 mm) Load at Fitted Length ...... ...... ...... ...... 15.4 Ibf ± 2 lbf (7 kgf ± 0,91 kgf) Fitted Position ...... ...... ...... ...... Damper Coils to Cylinder Head Outer Valve Springs Fitted Length ...... ...... ...... ...... 1.780 in (45,22 mm) Load at Fitted length ...... ...... ...... ...... 40 lbf ± 2 Ibf (18,1 kgf ± 0,91 kgf) Fitted Position ...... ...... ...... ...... Damper Coils to Cylinder Head Tappets Overall Length ...... ...... ...... ...... 2.96875 in (75,41 mm) Outside Dia.  Tappet Shank . ...... ...... ...... 0.7475/0.7485 in (18,99/19,01 mm) Cylinder Block Tappet Bore Dia. ...... ...... 0.750/0.7512 in (19,05/19,08 mm) Tappet Running Clearance in Bore ...... ...... 0.0015/0.0037 in (0,04/0,09 mm) Outside Dia.  of Tappet Foot ...... ...... ...... 1.1875 in (30,16 mm) Rocker Shaft Overall Length of Shaft ...... ...... ...... 16.78125 in (426,24 mm) Outside Dia.  of Shaft ...... ...... ...... ...... 0.7485/0.7495 in (19,01/19,04 mm) Rocker Levers Inside Dia.  of Lever Bore ...... ...... ...... 0.7505/0.7520 in (19,06/19.10 mm) Lever Clearance on Rocker Shaft  .... ...... ...... 0.001/0.0035 in (0,03 /0,09 mm)