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Old 01-10-2017, 02:25 AM
73vert 73vert is offline
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Default Vacuum hose question

Installing the different vacuum lines and electrical that run through the the firewall prior to installing engine. 1973 convertible small block 4 speed. My question concerns the large rubber grommet that the headlamp control vacuum lines run through. Mine has 3 holes, photos I have of disassembly shows 2 lines passing through this grommet and the AIM manual shows 2 hoses. I've seen new grommets on line for this application that have 3 holes. What is the third hole for? I'm guessing it should be closed off somehow if not used?
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Old 01-10-2017, 10:04 PM
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rtj rtj is online now
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Probably "one size fits all" repop. Zip says 68-82 3 hole.

RTV one hole.

Edit: 69 and 70 have a line for the wiper door. The diagrams show them with the headlight lines.

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Last edited by rtj : 01-11-2017 at 12:50 AM.
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