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10-21-2012, 01:29 PM
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GM Intake Manifold Port Thread Size
Hey my names Tim and i am the new guy here, i am currently in the process of rebuilding my first engine and need some help. I have a GM intake manifold with casting number 34625012, does anybody know what thread size is used on the vacuum port for the break booster and the port for the heater hose?
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10-21-2012, 01:41 PM
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pipe thread,forget the size though,sorry
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10-21-2012, 02:18 PM
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The heater hose port appears to be 1/2 NPT, not sure though i can't test it now. I have no idea what the vacuum port thread size is, its bigger than 1/4 NPT, maybe 3/8 NPT?
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