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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2007 Posts: 98 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2007 Posts: 98 | My '41 1/2 ton has a '54 235. On the intake manifold just below the carb there is old "line" that has been closed up with a screwed in brass plug. Looking at pictures of other similar engines, I'm not seeing the same thing. However, when looking at '41 - '46 engines, I see this line running somewhere toward the back part of the block. Is it possible that a PO put an older manifold on a '54 block? What is going on - and more importantly what should I do? | | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | On the side of the intake should be a threaded hole for vacuum to wiper motor. Maybe that's it???? Look at photos in the gallery or links at other motors. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The only port I'm aware of in that location would be the vacuum port for the wipers, or on later trucks, the HydroVac brake booster.
Bill Burmeister
| | | | | Joined: Sep 2001 Posts: 581 Shop Shark | | Shop Shark Joined: Sep 2001 Posts: 581 | Only use for vacuum I can think of would be 1. Wipers, 2. Hydrovac or vacuum assist brakes, 3. Vacuum Primer for a fire engine. On my trucks, the tube you're describing is a seperate piece below the carb, basically an insulator with a tube stuck into it, not actually part of the manifold. No reason you can't remove it if it's not being used, though I think you'll need shorter studs for the carberator to bolt to then. Not worth the trouble, in my opinion. Just leave it plugged. Tell people it's the blinker booster!  -Michael | | |
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