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Starting in 1987, Chevy began using a rail-style rocker arm that centers the rocker arm over the valve tip using these “rails” stamped into the rocker arm. Rail-style rocker arms do not require guideplates.
My Generation Camaro, Part IV - 1987 Chevy Camaro Heads, Porting & a Cam

Starting in 1987, Chevy began using a rail-style rocker arm that centers the rocker arm over the valve tip using these “rails” stamped into the rocker arm. Rail-style rocker arms do not require guideplates.  View Related Article