GM Corvette 1963-1982 Repair Guide

Rocker Arms and Studs

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REMOVAL & INSTALLATION



1 / 8 inch bead is sufficient. Always run the bead on the inside of the bolt holes.

See Figures 1, 2, 3 and 4

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Fig. Fig. 1: Removing the rocker arm stud



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Fig. Fig. 2: The rocker arm stud bore must be reamed out using the proper tool



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Fig. Fig. 3: Installation of the rocker arm stud



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Fig. Fig. 4: View of the rocker arms and related components

Some engines are assembled using RTV silicone sealant in place of rocker arm cover gasket. If the engine was assembled using RTV, never use a gasket when reassembling. Conversely, if the engine was assembled using a rocker arm cover gasket, never replace it with RTV. When using RTV, an

Rocker arms are removed by removing the adjusting nut. Be sure to adjust valve lash after replacing rocker arms. When replacing an exhaust rocker, move an old intake rocker to the exhaust rocker arm stud and install the new rocker arm on the intake stud.

Rocker arm studs that have damaged threads or are loose in the cylinder heads may be replaced with new studs available in 0.003 in. and 0.013 in. oversize or the bores may be tapped and screw-in replacement studs used. Do not attempt to install an oversize stud without reaming the stud bore. Studs are press-fit. Mark IV (big block V8) and late high performance small-block engines use screw-in studs and pushrod guide plates.

If engine is equipped with the A.I.R. exhaust emission control system, the interfering components of the system must be removed. Disconnect the lines at the air injection nozzles in the exhaust manifolds.

 
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