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I have a 230 inline 6 in my 65 GMC, there is a plug large above the intake. water temp sender on thermostat housing & oil sender on other side. What is it ??

The other thing How to adjust lifter/valves ??


Thanks

stepsider65
 

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well the plug in the intake would be for vacuum the other 2 I'm not sure what you mean a picture would get you the answer your looking for
 

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What happened to the pic....anim_63
 

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That plug is in the head the orange part just below that is the intake the gray part is the exhaust manifold. Is there another item you have questions about ?:)
 
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