Mercury 305 CID - Page 205

ENGINES - 3A-1390-823225--1 1096
350 CID Gen + Engine Specifications
Unit Of Measurement
In. (mm)
VALVE SYSTEM
Lifter Type Roller Hydraulic
Rocker Arm Ratio 1.50 to 1
Valve Lift
Intake .431 (10.947)
Valve
Lift
Exhaust .450 (11.43)
Valve Lash (Intake & Exhaust) 1 Turn Down from Zero Lash
Face Angle (Intake & Exhaust) 45°
Seat Angle (Intake & Exhaust) 46°
Seat Runout (Intake & Exhaust) .002 (0.05) Max
Seat Width
Intake .040-.0625 (1.02-1.65)
Seat
Width
Exhaust .065-.098 (1.65-2.49)
S
Production
Intake .0010-.0027 (0.025-0.069)
Stem
Cl
Production
Exhaust .0010-.0027 (0.025-0.069)
Clearance
Service
Intake High Limit Production + .001 (0.025)
Service
Exhaust High Limit Production + .0002 (0.050)
VALVE SPRING
Free Length 2.02 (51.3)
Valve Spring
Pressure
Valve
Closed
76-84 Lb. Ft. (338-374 N) at 1.70 (43.18)
V
a
l
ve
S
pr
i
ng
Valve Open 187-203 Lb. Ft. (832-903 N) at 1.27 (32.26)
Installed Height Intake 1.69-1.71 (42.92-43.43)