For the 4.3L engines which are equipped with screw-in type rocker arm studs with positive stop shoulders, tighten the rocker arm adjusting nuts against the stop shoulders to 20 ft. lbs. (27 Nm) on 1994-96 models and 18 ft. lbs. (25 Nm) on 1997-99 models. No further adjustment is necessary, or possible.
For most 4.3L engines which are not equipped with screw-in type rocker arm studs and positive stop shoulders, properly adjust the valve lash. For details on valve lash adjustment, please refer to the procedure in Routine Maintenance . (see below)
4.3L Engine
The 4.3L engines may be equipped with either of 2 rocker arm retaining systems. If your engine utilizes screw-in type rocker arm studs with positive stop shoulders, no valve lash adjustment is necessary or possible. If however, you engine utilizes the pressed-in rocker arm studs, use the following procedure to tighten the rocker arm nuts and properly center the pushrod on the hydraulic lifter:
To prepare the engine for valve adjustment, rotate the crankshaft until the mark on the damper pulley aligns with the 0? mark on the timing plate and the No. 1 cylinder is on the compression stroke. You will know when the No. 1 piston is on it's compression stroke because both the intake and exhaust valves will remain closed as the crankshaft damper mark approaches the timing scale.
Another method to tell when the piston is coming up on the compression stroke is by removing the spark plug and placing your thumb over the hole, you will feel the air being forced out of the spark plug hole. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer or the zero mark on the scale.
The valve arrangement is as follows:
With the engine on the compression stroke, adjust the exhaust valves of cylinders No. 1, 5 & 6 and the intake valves of cylinders No. 1, 2 & 3 by performing the following procedures:
Back out the adjusting nut until lash can be felt at the pushrod.
While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turns.
Rotate the crankshaft one complete revolution and align the mark on the damper pulley with the 0? mark on the timing plate; the engine is now positioned on the No. 4 firing position. This time the No. 4 cylinder valves remain closed as the timing mark approaches the scale. Adjust the exhaust valves of cylinders No. 2, 3 & 4 and the intake valves of cylinders No. 4, 5 & 6, by performing the following procedures:
Back out the adjusting nut until lash can be felt at the pushrod.
While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turn.
THERE IS NO TORQUE SPEC FOR HYDROLIQUE LIFTERS
YOU ADJUST VALVES PER SPECIFICATION USUALLY
TIGHTEN UNTIL NO FREEPLAY BETWEEN LIFTER AND PUSHROD
THEN 1/2 OR 3/4 TURN MORE SO HYDROLIQUE LIFTER CAN PUMP
OIL UP THE PUSHROD TO LUBRICATE TOP END
LOOK UP SPEC TO BE SHURE OF FINAL TURN
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The 2000 Chevy Impala 3.4 liter engine rocker arm bolt torque specification is 45 pounds. The rocker arm bolts should be torqued in 15 pound intervals.
Here is a suggested updated torque spec for this engine's rocker arm bolts;
Rocker arms
Step one: Torque to 11 ft lbs then tighten an additional 90 degrees of bolt head rotation. Some guys don't fuss with the torque specs and just get them good and tight. Either way, be careful, as the heads are aluminum. You do not want to over tighten these bolts
Could it be a F-150 instead?
Ford Engine Bolt Torque Chart
Bolt Torque Spec Chart for Ford Engines
These specs are for stock-type bolts with light engine oil applied to the threads and the underside of the bolt head. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque figure. If you use after-market performance bolts like ARP's, you should follow the recommended torque specifications.
260, 289, 302 Torque Spec. Fastener TypeTorque Spec
Main cap bolts
60-70 ft-lbs
Outer main cap bolts
35-40 ft-lbs.
Connecting rod bolts
(40-45 ft-lbs. for 289 HP & Boss 302)
Cylinder head bolts
65-72 ft-lbs.
Rocker arms
17-23 ft-lbs.
Intake manifold bolts
23-25 ft-lbs
Oil pump bolt
23-28 ft-lbs.
Cam bolts
40-45 ft-lbs.
Cam thrust plate bolts
8-10 ft-lbs.
Harmonic damper bolts
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-15 ft-lbs.
351W Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs
Connecting rod bolts
40-45 ft-lbs.
Cylinder head bolts
90-100 ft-lbs.
Rocker arms
17-23 ft-lbs.
Intake manifold bolts
23-25 ft-lbs.
Oil pump bolts
23-28 ft-lbs.
Cam bolts
40-45 ft-lbs.
Cam thrust plate bolts
8-10 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-15 ft-lbs.
351C, 351M Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs.
Connecting rod bolts
40-45 ft-lbs. (45-50 ft-lbs. For Boss 351C)
Cylinder head bolts
105 ft-lbs. (125 ft-lbs. For Boss 351C)
Rocker arms (non-adjustable)
Rocker arms (non-adjustable)
5/16in. intake manifold bolts
21-25 ft-lbs.
3/8in. intake manifold bolts
28-23 ft-lbs
Oil pump bolt
25 ft-lbs.
Cam bolts
40-45 ft-lbs.
Cam thrust plate bolts
9-12 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-18 ft-lbs.
360, 390, 406, 427, 428FE Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs.
Crossbolts for 406-427
40 ft-lbs.
Connecting rod bolts
40-45 ft-lbs. (53-58 ft-lbs. For 406 and 427)
Cylinder head bolts
80-90 ft-lbs. (100-110 ft-lbs. For 1963-67 427)
Rocker arm shaft bolts
40-45 ft-lbs.
Intake manifold bolts
32-35 ft-lbs.
Oil pump bolt
12-15 ft-lbs.
Cam bolts
40-45 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-15 ft-lbs.
429-460 Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs
Connecting rod bolts
40-45 ft-lbs.
Cylinder head bolts
140 ft-lbs.
Rocker arms (non-adjustable)
18-22 ft-lbs.
Intake manifold bolts
25-30 ft-lbs.
Oil pump bolt
25 ft-lbs.
Cam bolts
40-45 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-18 ft-lbs.
Ford Engine Bolt Torque Chart
Bolt Torque Spec Chart for Ford Engines
These specs are for stock-type bolts with light engine oil applied to the threads and the underside of the bolt head. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque figure. If you use after-market performance bolts like ARP's, you should follow the recommended torque specifications.
260, 289, 302 Torque Spec. Fastener TypeTorque Spec
Main cap bolts
60-70 ft-lbs
Outer main cap bolts
35-40 ft-lbs.
Connecting rod bolts
(40-45 ft-lbs. for 289 HP & Boss 302)
Cylinder head bolts
65-72 ft-lbs.
Rocker arms
17-23 ft-lbs.
Intake manifold bolts
23-25 ft-lbs
Oil pump bolt
23-28 ft-lbs.
Cam bolts
40-45 ft-lbs.
Cam thrust plate bolts
8-10 ft-lbs.
Harmonic damper bolts
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-15 ft-lbs.
351W Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs
Connecting rod bolts
40-45 ft-lbs.
Cylinder head bolts
90-100 ft-lbs.
Rocker arms
17-23 ft-lbs.
Intake manifold bolts
23-25 ft-lbs.
Oil pump bolts
23-28 ft-lbs.
Cam bolts
40-45 ft-lbs.
Cam thrust plate bolts
8-10 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-15 ft-lbs.
351C, 351M Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs.
Connecting rod bolts
40-45 ft-lbs. (45-50 ft-lbs. For Boss 351C)
Cylinder head bolts
105 ft-lbs. (125 ft-lbs. For Boss 351C)
Rocker arms (non-adjustable)
Rocker arms (non-adjustable)
5/16in. intake manifold bolts
21-25 ft-lbs.
3/8in. intake manifold bolts
28-23 ft-lbs
Oil pump bolt
25 ft-lbs.
Cam bolts
40-45 ft-lbs.
Cam thrust plate bolts
9-12 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-18 ft-lbs.
360, 390, 406, 427, 428FE Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs.
Crossbolts for 406-427
40 ft-lbs.
Connecting rod bolts
40-45 ft-lbs. (53-58 ft-lbs. For 406 and 427)
Cylinder head bolts
80-90 ft-lbs. (100-110 ft-lbs. For 1963-67 427)
Rocker arm shaft bolts
40-45 ft-lbs.
Intake manifold bolts
32-35 ft-lbs.
Oil pump bolt
12-15 ft-lbs.
Cam bolts
40-45 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-15 ft-lbs.
429-460 Torque Spec. Fastener TypeTorque Spec
Main cap bolts
95-105 ft-lbs
Connecting rod bolts
40-45 ft-lbs.
Cylinder head bolts
140 ft-lbs.
Rocker arms (non-adjustable)
18-22 ft-lbs.
Intake manifold bolts
25-30 ft-lbs.
Oil pump bolt
25 ft-lbs.
Cam bolts
40-45 ft-lbs.
Harmonic damper bolt
70-90 ft-lbs.
Flywheel / flex-plate bolts
75-85 ft-lbs.
Pressure plate bolts
35 ft-lbs.
Front cover bolts
12-18 ft-lbs.
www.gbodyolds.com/forum/showthread.php?754-Oldsmobile-Torque... Feb 7, 2013 - 2 posts - ‎2 authors
Oldsmobile Small-Block Engines Cylinder Head Bolts (1/2in. bolt) 130 ft. lbs. Cylinder Head ... Rocker Arm Pivot Bolt 25 ft. lbs. Rod Bearing ...
AutoZoneGM Cutlass RWD 1970-1987 Repair Guide ... To remove the rocker arms from the shaft, the nylon arm retainers must be removed. ... 7: Engine valve system, 260, 307, 350, 403 Oldsmobile built engines ... Unfasten the two bolts that attach the rocker arm pivot to the cylinder head. ... Torque the retaining bolts to 25 ft. lbs.
You don't. They are non-adjustable hydraulic lifters. GM's spec for torque on the rocker arm nuts: Tighten the valve rocker arm ball studs to 47 N·m (35 lb ft).
Once the valve rocker arm nuts are installed and properly torqued, no
additional valve lash adjustment is required.
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