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Engine Specifications
General Data:
Type
V6
Displacement
4.3L (262 Cu. In.)
RPO
LB4
Bore
4.00
Stroke
3.48
Compreesion Ratio
8.35:1
Firing Order
1 - 6 - 5 - 4 - 3 - 2
Oil Pressure (Minimum)
6 psi@1000 RPM; 18 psi@2000 RPM; 24 psi@4000 RPM
Cylinder Bore:
Diameter
3.9995-4.0025
Out Of
Round
 
0.001 (Max)
 
0.002 (Max)
Taper
Production
Thrust Side
0.0005 (Max)
Relief Side
0.001 (Max)
 
0.001 (Max)
Piston:
Clearance
Production
0.0015 - 0.0030
Service Limit
0.0027 (Max)
Piston Ring:
C
o
m
p
Groove
Clearance
Gap
O
i
l
Groove
Clearance
Gap
Production
Top
2nd
Service Limit
Production
Top
2nd
Service Limit
Production
Service Limit
Production
Service Limit
0.0012 - 0.0032
Hi Limit Production + 0.001
0.010 - 0.020
0.010 - 0.025
Hi Limit Production + 0.001
0.002 - 0.007
Hi Limit Production + 0.001
0.015 - 0.055
Hi Production + 0.010
Piston Pin:
Diameter
0.9270 - 0.9273
Clearance
In Piston
Production
0.0002 - 0.0007
Service Limit
0.001 (Max)
Fit In Rod
0.0008 - 0.0016 Interference
Displacement:
4.3L
Crankshaft
Main
Journal
Diameter
#1
2.4484 - 2.4493
#2, #3
2.4481 - 2.4490
#4
2.4479 - 2.4488
Taper
Production
0.0002 (Max)
Service Limit
0.001 (Max)
Out Of
Round
Production
0.0002 (Max)
Service Limit
0.001 (Max)
Main
Bearing
Clearance
Production
#1
0.0008 - 0.0020
#2, #3
0.0011 - 0.0023
#4
0.0017 - 0.0032
Service Limit
#1
0.0010 - 0.0015
#2, #3
0.0010 - 0.0025
#4
0.0025 - 0.0035
Crankshaft End Play
0.002 - 0.006
Crankpin
Diameter
2.2487 - 2.2497
Taper
Production
0.0005
Service Limit
0.001 (Max)
Out Of
Round
Production
0.0005
Service Limit
0.001 (Max)
Rod Bearing
Clearance
Production
0.0013 - 0.0035
Service Limit
0.0030
Rod Side Clearance
0.006 - 0.014
Camshaft:
Lobe
Lift ± 0.002
Intake
0.357
Exhaust
0.390
Journal Diameter
1.8682 - 1.8692
Camshaft End Play
0.004 - 0.012
Valve System:
Lifter
Hydraulic
Rocker Arm Ratio
1.50:1
Valve Lash Intake
One Turn Down From Zero Lash
Exhaust
Face Angle (Intake & Exhaust)
45*
Seat Angle (Intake & Exhaust)
46*
Seat Runout (Intake & Exhaust)
0.002 (Max)
Seat Width Intake
1/32 - 1/16
Exhaust
1/16 - 3/32
Stem
CLearance
Production
Intake
0.0010 - 0.0027
Exhaust
0.0010 - 0.0027
Service
Intake
Hi Limit Production + 0.001
Exhaust
Hi Limit Production + 0.002
Valve
Spring
(Outer)
Free Length
2.03
Pressure
lbs. @ in.
Closed
76-84 lbs. @ 1.70-in.
Open
194-206 lbs. @ 1.25-in.
Installed Height
± 1/32
1 23/32
Valve Spring
Damper
Free Length
1.86
Approx. # of Coils
4
Matt H
Robert P
Les Y
Tony M
Jeff D
Nolan N
Jack O
Mark L
Hunter
John W
9.89@137 10.26@13
10.29@137 10.71@126
10.79@126
10.95@123
11.00@128
11.00@122
11.19@121
11.20@128
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