SCREW IN STUDS AND GUIDE PLATES:

Fig 3.10.10

 All rocker arm studs prior to 1970 were pressed into the head. In 1970 all the high performance cylinder heads had screw in rocker arm studs and push rod guide plates. If you find a set of cylinder heads cast before the 1970 model year with screw in studs they have been modified and did not come from the factory that way.

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