Rocker arms
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When screw in studs are going to be installed, the stud boss will usually need to be machined shorter to make up for the thickness of the guide plate (if used) and for the hex portion of the stud and the radius between the hex and the stud. In the case of the early style SBC, 0.400" is usually a safe amount to remove, but this can vary some depending on the exact parts used. | When screw in studs are going to be installed, the stud boss will usually need to be machined shorter to make up for the thickness of the guide plate (if used) and for the hex portion of the stud and the radius between the hex and the stud. In the case of the early style SBC, 0.400" is usually a safe amount to remove, but this can vary some depending on the exact parts used. | ||
| + | ==Rocker arm adjustment nuts== | ||
| + | Polylocs are the preferred method to hold the rocker arm adjustment. The stud needs to have a flat or even surface for the center locking allen nut to tighten against. | ||
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| + | [[File:Images.jpg|thumb|350px|right|Arrows show where self locking nut was "pinched" to disrupt threads to make the nut lock to the stud threads]] | ||
| + | If you're using stock lock nuts, they use a disrupted thread on the top side of the nut (arrows, right), so getting the nut to start on the stud is nearly- if not completely- impossible, unless the nut is correctly orientated on the stud (flat side down, as said). Replace these lock nuts if they've been used much; the self locking function loosens w/use. | ||
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| + | Self locking rocker nuts can do a number on aftermarket studs, so use polylocs when possible. In some cases polylocs cause clearance problems w/the valve cover so check first. Using a thick or doubled gasket will sometimes give enough clearance. Using polylocs on stock studs will not always work- the polylocs need an even surface for the set screw to register on, often stock studs are uneven on the top. | ||
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==Converting a non-adjustable valve train== | ==Converting a non-adjustable valve train== | ||
Old and new engines have both used net lash or non adjustable rocker arm arrangements. The latest Chevy engines are now among these; for years the Chevy V8 enjoyed the benefits of an adjustable stud-and-rocker setup but unfortunately that's gone by the wayside. | Old and new engines have both used net lash or non adjustable rocker arm arrangements. The latest Chevy engines are now among these; for years the Chevy V8 enjoyed the benefits of an adjustable stud-and-rocker setup but unfortunately that's gone by the wayside. | ||
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