5.0l / 305 cid / 5.7l / 350 cid ENGINES
SERVICE MANUAL NUMBER 24
90-861327--1 OCTOBER 1999
Page 3A-9
VALVE SYSTEM
Engine
305 cid (5.0L)
350 CID (5.7L)
Lifter Type
Roller Hydraulic
Rocker Arm Ratio
1.50 to 1
Intake
0.2744-.2783 (6.97-7.07)
Valve Lift
Exhaust
0.2834-.2874 (7.20-7.30)
Valve Lash
(Intake and Exhaust)
1 Turn Down from Zero Lash
Intake
45
°
Face Angle
Exhaust
45
°
Seat Angle (Intake & Exhaust)
46
°
Seat Runout (Intake & Exhaust)
0.0019 (0.05) Max
Intake
0.03448-0.070
(1.14-1.78)
0.0401-0.0649
(1.02-1.65)
Seat Width
Exhaust
0.0649-0.098
(1.65-2.49)
0.059-0.100
(1.50-2.56)
Intake
0.00098-0.0027 (0.025-0.069)
Production
Exhaust
0.00098-0.0027 (0.025-0.069)
Stem
Clearance
Intake
0.00098-0.0037 (0.025-0.094)
Clearance
Service
Exhaust
0.00098-0.0037
(0.025-0.094)
0.0010-0.0076
(0.025-0.194)
Intake
.341 (8.66)
Stem Diameter
Exhaust
.341 (8.66)
Intake
1.84 (46.74)
1.94 (49.28)
Valve Diameter
Exhaust
1.50 (38.1)
Valve Margin After Surfacing - Intake and Exhaust
0.031 (0.79) Minimum
VALVE SPRING
Engine
5.0l / 305 cid / 350 cid (5.7L)
Free Length
2.019 (51.3)
Valve
Closed
76-84 Lb. (338-374 N) at 1.7 (43.2)
Pressure
Valve
Open
187-203 Lb. (832-903 N) at 1.27 (32.3)
Valve Spring
Installed
Intake
1.68-1.70 (42.92-43.43)
Installed
Height
Exhaust
1.68-1.70 (42.92-43.43)
Free Length
2.019 (51.3)
Approximate Number of
Coils
4
Index