CYLINDER HEAD ACCESSORY HOLES:

1955 through 1968

Fig. 3.10.9a

1955-1968

 1968 - Present

Fig. 3.10.9b

1968-present

Fig.3.10.9c

  ? 1965-?

  All cylinder heads before 1968 were cast with out accessory holes as shown in Fig. 3.10.9a then in 1968 some of the heads were cast with the accessory holes and by 1969 all cylinder heads were cast with the accessory holes as shown in Fig. 3.10.9c. An Exception to these are the the truck heads in Fig. 3.10.9c I have not been able to find any info as to what years these heads were used but I personal saw a set of these heads on a 1965 truck with the original engine so they go back at least that far.

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