Chevrolet 1991 Light Duty Truck Repair Manual page 449

All Specifications are in INCHES w le s s otherw ise noted.
DISPLACEMENT:
CRANKSHAFT:
Diameter
Main
Journal
Production
Main
Bearing
Clearance
Service Limit
Crankshaft End Play
Crankpin
Rod Bearing
Clearance
Rod Side Clearance
CAMSHAFT:
Lobe
Lift ± 0.002
Journal Diameter
Camshaft End Play
VALVE SYSTEM:
Lifter
Rocker Arm Ratio
Valve Lash
Face Angle (Intake & Exhaust)
Seat Angle (Intake & Exhaust)
Seat Runout (Intake & Exhaust)
Seat Width
Stem
Production
Clearance
Free Length
Valve
Pressure
Spring
lbs. (S > in.
(Outer)
Installed Height ± 1/32"
Valve Spring
Damper
SPECIFICATIONS (CONT.)
ENGINE SPECIFICATIONS (CONT.)
#1
#2, #3
#4
Taper
Out Of Round
#1
#2, #3
#4
#1
#2, #3
#4
Diameter
Taper
Out of Round
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Closed
Open
Free Length
Approx. # of Coils
4.3L V6 ENGINE 6A3-29
4.3L (262 CID)
2.4484-2.4493
2.4481-2.4490
2.4479-2.4488
0.0002 (Maximum)
0.0002 (Maximum)
0.0008-0.0020
0.0011-0.0023
0.0017-0.0032
0.0010-0.0015
0.0010-0.0025
0.0025-0.0035
0.002-0.006
2.2487-2.2497
0.0005
0.0005
0.0013-0.0035
0.006-0.014
LB4/.234 LU2/.269
.257 .276
1.8682-1.8692
0.004-0.012
Hydraulic
1.50:1
One Turn Down From Zero Lash
45°
46"
0.002 (Maximum)
1/32-1/16
1/16-3/32
0.0010-0.0027
0.0010-0.0027
2.03
76-84 lbs. @ 1.70-in.
194-206 lbs. (g > 1.25-in.
1 23/32
1.86
4
T2365