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What is the difference in the big chief head bolt pattern and the standard bbc conventional head pattern?
 

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18* dart big chiefs will have 4 extra threaded bolt holes on the intake side, in the head deck surface. If your block has the provision for the extra bolts (in the oil galley you can run them. Most people only run 4 as the other 4 are right next to another bolt hole. This is how my big chiefs were.
 

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just look at the fel pro book that has picture illustrations of the head gasket.

as said above post #3,

most blocks will have the added bosses or holes drilled.

the earliest original chevy produced PONTIAC heads (10045427) have stock head bolt holes, even though the intake ports are symetrical and evenly spaced....

there are at least three different bolt patterns./ various heads.
 
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