1999 Volvo Penta "WT" Models Workshop Manual, Page 296Get this manual
Engine Specifications Valve Systems:
Lifter Type Rocker Arm Ratio 7.4 GSi Hydraulic
1.7 to 8.2 GSi 1.7 to Valve LashIntake and Exhaustzero lash one turn Valve Face Angle (IE) 45
Valve Seat Angle (IE) Valve Seat Runout {IE} 46 0.002 in(0,0508 mm) Max
Stem to Guide Clearance