Chevrolet Nova/ChevyII 1962-1979

Cylinder Head

Print

REMOVAL AND INSTALLATION



4 and 6-Cylinder Engines


Click image to see an enlarged view

Fig. Fig. 1 Cylinder head bolt torque sequence-4-cylinder engines



Click image to see an enlarged view

Fig. Fig. 2 Cylinder head bolt torque sequence-6-cylinder engines



Click image to see an enlarged view

Fig. Fig. 3 To remove the cylinder head, disconnect the exhaust pipe from the manifold flange



Click image to see an enlarged view

Fig. Fig. 4 Unfasten the exhaust manifold retaining bolts ...



Click image to see an enlarged view

Fig. Fig. 5 ... then remove the manifold and carburetor as as assembly



Click image to see an enlarged view

Fig. Fig. 6 Unfasten the rocker arm cover bolts ...



Click image to see an enlarged view

Fig. Fig. 7 ... then remove the rocker arm cover from the cylinder head



Click image to see an enlarged view

Fig. Fig. 8 Scrape off all the old gasket material



Click image to see an enlarged view

Fig. Fig. 9 Loosen the rocker arm nuts ...



Click image to see an enlarged view

Fig. Fig. 10 ... then pivot the rocker arms to clear the pushrods for removal



Click image to see an enlarged view

Fig. Fig. 11 When removing the pushrods, keep them in order so they can be reinstalled in their original positions



Click image to see an enlarged view

Fig. Fig. 12 After unfastening the cylinder head bolts, remove the head from the engine block



Click image to see an enlarged view

Fig. Fig. 13 Remove and discard the cylinder head gasket



Click image to see an enlarged view

Fig. Fig. 14 Cover the cylinder bores and carefully scrape off any remaining gasket material



Click image to see an enlarged view

Fig. Fig. 15 Always tighten the cylinder head bolts to the proper torque using the correct sequence

1962-77 VEHICLES
  1. Drain the cooling system and remove the air cleaner. Disconnect the PCV hose.
  2.  
  3. Disconnect the choke cable (four-cylinder), the accelerator pedal rod at the bellcrank on the manifold, and the fuel and vacuum lines at the carburetor.
  4.  
  5. Disconnect the exhaust pipe at the manifold flange, then remove the manifold bolts and clamps and remove the manifolds and carburetor as an assembly.
  6.  
  7. Remove the fuel and vacuum line retaining clip from the water outlet. Disconnect the wire harness from the heat-sending unit and coil, leaving the harness clear of the clips on the rocker arm cover.
  8.  
  9. Disconnect the radiator hose from the water outlet housing and the battery ground strap at the cylinder head.
  10.  
  11. Tag and disconnect the wires and remove the spark plugs. On the six-cylinder engine, disconnect the coil-to-distributor primary wire lead at the coil and remove the coil.
  12.  
  13. Remove the rocker arm cover. Back off the rocker arm nuts, pivot the rocker arms to clear the pushrods, and remove the pushrods.
  14.  
  15. Remove the cylinder head bolts, cylinder head, and gasket.
  16.  

To install:

  1. Place a new cylinder head gasket over the dowel pins in the cylinder block.
  2.  
  3. Guide and lower the cylinder head into place over the dowels and gasket.
  4.  
  5. Oil the cylinder head bolts, install, and run them down snugly.
  6.  
  7. Tighten the cylinder head bolts a little at a time with a torque wrench in the correct sequence. Final torque should be 90-95 ft lbs.
  8.  
  9. Install the valve pushrods down through the cylinder head openings and seat them in their lifter sockets.
  10.  
  11. Install the rocker arms, balls, and nuts, and tighten the rocker arm nuts until all pushrod play is taken up.
  12.  
  13. Install the thermostat, thermostat housing, and water outlet, using new gaskets. Connect the radiator hose.
  14.  
  15. Install the heat-sending switch and torque to 15-20 ft lbs.
  16.  
  17. Clean the spark plugs or install new ones. Set the gaps.
  18.  
  19. Torque 13 / 16 in. hex plugs to 20 ft lbs. and 5 / 8 in. hex plugs to 15 ft lbs. Tapered seat plugs are used on some engines starting in 1970 and all engines beginning in 1971.
  20.  
  21. Install the coil (on six-cylinder engines) then connect the heat-sending unit and coil primary wires, and connect the battery ground cable at the cylinder head.
  22.  
  23. Clean the surfaces and install a new gasket over the manifold studs. Install the manifold. Install the bolts and clamps and torque as specified.
  24.  
  25. Connect the throttle linkage and the choke wire (on the four-cylinder engine).
  26.  
  27. Connect the PCV, fuel, and vacuum lines and secure the lines the clip at the water outlet.
  28.  
  29. Fill the cooling system and check for leaks.
  30.  
  31. Adjust the valve lash.
  32.  
  33. Install the rocker arm cover and position the wiring harness in the clips.
  34.  
  35. Clean and install the air cleaner.
  36.  

1978-79 VEHICLES
  1. Remove the intake manifold as described in the appropriate procedure in this section.
  2.  
  3. Remove the rocker cover. Loosen rocker arm nuts, and then rotate rocker arms to disengage them from the pushrods. Mark pushrod locations, and then remove them.
  4.  
  5. Drain the cooling system into a suitable container.
  6.  
  7. Remove fuel and vacuum lines from the clip at the thermostat housing, and disconnect all wiring from temperature sending units. Where engine has an air pump, disconnect the air injection hose at the check valve.
  8.  
  9. Disconnect battery ground strap. Disconnect upper radiator hose from the thermostat housing.
  10.  
  11. Remove cylinder head bolts, and then remove head and gasket. Inspect the head for warpage and cracks, as described below in the rebuilding section.
  12.  

Make sure gasket surfaces on both head and block are clean of foreign matter, and free of any nicks or heavy scratches. Bolt threads and female thread in the block must be clean. Do not use gasket sealer with a composition steel and asbestos gasket.

  1. Coat gasket with sealer, unless it's a composition gasket. Position the gasket over the dowel pins.
  2.  
  3. Carefully guide the head into position over the dowel pins and gasket.
  4.  
  5. Coat threads of all cylinder head bolts with sealing compound and install hand-tight. Then, going in the sequence shown above, tighten to 95 ft lbs. torque in several stages. Note that the torque for the left-hand front bolt is 85 ft lbs. on 1978 and later engines, not 95 ft lbs.
  6.  
  7. Connect the upper radiator hose and battery ground. Connect temperature sending unit wiring, and reposition fuel and vacuum lines under the clip on the thermostat housing. Fill the cooling system.
  8.  
  9. Install the manifold assembly as described in the appropriate procedure in this section.
  10.  
  11. Install the pushrods in their former positions and adjust valve mechanism as described in the appropriate procedure.
  12.  
  13. Install the rocker cover with a new gasket, and tighten the bolts evenly to the required torque. Reconnect the air injection hose.
  14.  

V8 Engines


Click image to see an enlarged view

Fig. Fig. 16 Cylinder head bolt torque sequence-262, 283, 305, 307, 327 and 350 V8 engines



Click image to see an enlarged view

Fig. Fig. 17 Cylinder head bolt torque sequence-396 V8 engine

  1. Drain the coolant. Remove the air cleaner.
  2.  
  3. Disconnect the following components:
  4.  
    1. Battery.
    2.  
    3. Radiator and heater hose from manifold.
    4.  
    5. c. Throttle linkage
    6.  
    7. Fuel line
    8.  
    9. Coil wires
    10.  
    11. Temperature sending unit
    12.  
    13. Power brake hose, distributor vacuum hose, and crankcase vent hoses.
    14.  

  5. Remove the following components:
  6.  
    1. Distributor, marking position
    2.  
    3. Alternator upper bracket
    4.  
    5. Coil and bracket (where so equipped)
    6.  

  7. On 1977 and later engines, remove the following components, as applicable:
  8.  
    1. Air cleaner bracket
    2.  
    3. Air pump and bracket
    4.  
    5. Accelerator return spring and bracket
    6.  
    7. Accelerator bellcrank
    8.  

  9. Remove all manifold attaching bolts, and remove the intake manifold.
  10.  
  11. Disconnect the air manifold and tubes, and spark plug wires, remove the air cleaner preheater and spark plug heat shields, loosen and remove the exhaust manifold flange nuts, then lower the exhaust pipe assembly and hang it from the frame with wire.
  12.  
  13. Remove the manifold end bolts, then the center ones and remove the manifold from the engine.
  14.  
  15. Remove rocker cover(s). Loosen rocker nuts and pivot rockers 90° to permit removal of pushrods. Remove pushrods, marking the locating of each.
  16.  
  17. Remove the cylinder head bolts, cylinder head, and gasket.
  18.  
  19. Inspect the gasket surfaces on the head(s). All surface must be clean and free of nicks and burrs. The threads on bolts and inside the boltholes in the block must be clean. Inspect the head for warpage as described in the engine rebuilding section below.
  20.  

To install:

Install, reversing the removal procedures, keeping the following important points in mind:

  1. Tighten the head bolts in several stages, going in the pattern specified in the illustration.
  2.  
  3. Coat new gaskets (both sides) and headbolts with sealer, unless a composition steel-asbestos gasket is used; in that case, put sealer on head bolts only, and leave the gasket dry.
  4.  
  5. Make sure to relocate pushrods according to their markings. Adjust the valves according to the procedure labeled "Engine Not Running" before running the engine. Then, readjust the valves with the engine hot and running.
  6.  
  7. Coat new rocker cover gaskets with sealer, and tighten cover bolts to specified torque evenly in several stages.
  8.  

 
label.common.footer.alt.autozoneLogo