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Old 06-03-2012, 10:07 AM
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Thread Size on Edelbrock RPM Intake

Just putting my SBC back together & was wondering what the thread size is of the tapped hole on the top of the manifold right behind the carb.

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Old 06-03-2012, 12:08 PM
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if its the one im thinking, 3/8 NPT
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Old 06-03-2012, 04:06 PM
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Thanks Richie. That's what I suspected.
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Old 06-04-2012, 07:48 AM
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A quick FYI: The location of that hole will put most vacuum fittings in contact w/the fuel bowl of a Holley, so if you are using the port for vacuum and not just blocking it off, you'll want to use a low profile 90 degree fitting, maybe like Edelbrock p/n 8096 (shown below, male 3/8 NPT to female 1/8 NPT) to clear the Holley rear float bowl. Or you can use a carb spacer if there's room enough.

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