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The unique nature of the Hi-Po head is apparent here: valvespring stability pockets and screw-in rocker-arm studs. This is testimony to the durability of those cast-iron rocker arms. The high-revving Hi-Po was fitted with them from 1963 to 1967. Rail-style rocker arms used from May 8, 1966 forward were common only to the 2V and 4V engines.