Chevrolet 1980 Light Duty Truck Service Manual page 451

VALVE SYSTEM
L IF T E R
R O C K E R A R M R A T IO
IN T A K E
V A L V E
O N E T U R N D O W N F R O M Z E R O L A S H
LASH
E X H A U S T
FA C E A N G L E (IN T . & E X H .)
S E A T A N G L E (IN T . & E X H .)
S E A T R U N O U T
IN T A K E
S E A T
W ID T H
E X H A U S T
IN T .
P R O D U C T IO N
S T E M
E X H
C L E A R A N C E
S E R V IC E
F R E E L E N G T H
5 6 - 6 4 @ 1 .6 6
P R E S S U R E C L O S E D
V A L V E
LBS. @ IN .
O PEN 1 6 6 -1 7 8 @ 1.26
S P R IN G
(O U T E R )
IN S T A L L E D H E IG H T
± 1 /3 2"
F R E E L E N G T H
D A M P E R
A P P R O X . # O F C O IL S
L25
LE3
H Y D R A U L IC
1.75:1
45 46
4 6 °
.0 0 2 M A X .
1 /3 2 -1 /1 6
1 /1 6 -3 /3 2
.0 0 1 0 - .0 0 2 7
.0 0 1 5 - .0 0 3 2
+ .001 I N T A K E
H I L I M IT
+ .002 EXHAUST
1.88
1.90
7 8 -8 6 @ 1.66
1 -2 1 /3 2 1-21/32
NONE
1.94
NONE
TORQUE SPECIFICATIONS
Camshaft Thrust P la te .......................................80 lb. in.
Crankshaft Front C o v e r.....................................80 lb. in.
Flywheel Housing Cover .................................80 lb. in.
Oil Pan (To Crankcase) (1/4-20) ..................... 80 lb. in.
Oil Pan (To Front Cover) .................................50 lb. in.
Oil Pump C o v e r.................................................. 70 lb. in.
Rocker Arm Cover ............................................ 45 lb. in.
Connecting Rod C a p .........................................35 lb. ft.*
Clutch Pressure P la te .......................................20 lb. ft.*
Oil Pan (To Crankcase) 5 /1 6 -1 8 )..................... 75 lb. in.
Oil P u m p ............................................................ 115 lb. in.
Push Rod Cover ................................................ 50 lb. in.
W ater P u m p ........................................................ 15 lb. in.
Clutch Pressure P la te .....................................30 lb. ft.@
D istributor Clamp .............................................. 25 lb. ft.
Flywheel Housing .............................................. 30 lb. ft.
M anifold (Exhaust) .........................................30 lb. ft. 2
M anifold (Exhaust To Inlet) ........................... 45 lb. ft
M anifold To H e a d .............................................40 lb. ft.
Therm ostat H o u s in g ...........................................30 lb. ft.
W ater O u tle t........................................................ 30 lb. ft.
Connecting Rod C a p .......................................40 lb. ft.@
Main Bearing C a p .............................................. 65 lb. ft.
F ly w h e e l..............................................................60 lb. ft.*
Torsional D a m p e r...........................................60 lb. ft.@
Cylinder H e a d ...................................................... 95 lb. f t . 1
Temperature Sending U n it ............................... 20 lb. ft.
Oil Filter ..........................................................Hand T ight
Oil Pan Drain P lu g .............................................. 20 lb. ft.
F lyw h e e l..........................................................110 lb. ft.@
Spark P lu g ...................................................... 17-27 lb. ft.
* 4.1 (D) only
@ 4.8 (T) only
1 Except LH Front Bolt 85 lb. ft.
2 Non-Integral Head