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Gun Totin *******
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It is an optional feature in the casting of the engine block as the engine was used in many different things world wide. Unused in your application.

@alex6691 Would love to see more pictures as you go along on your build, see how other people in the rest of the world do it.
 

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Gun Totin *******
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1,729 Posts
If used, a mechanical fuel pump would bolt into that hole and be driven by a lobe on the camshaft. If a remote electric fuel pump were used, this hole would have a cover plate.
Not entirely correct. The boss was cast into and block machined without a through hole to drive a mechanical fuel pump via camshaft lobe. No cover needed.
 
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