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Click on image for the lowdown. 
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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: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | The bigger vacuum port probably indicates it was on a larger truck with Hydro-vac brakes or pollution control equipment. Just plug it as you would or reduce it if you need vacuum for wipers or something. The carb should work fine with one caution some manifolds will interfere with the stock accelerator linkage so you may need to check that. | | |
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