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Mod | | | Forums66 Topics128,062 Posts1,055,856 Members48,428 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2009 Posts: 84 'Bolter | | 'Bolter Joined: Nov 2009 Posts: 84 | I am switching out my Rochester BC back to the '51 Rochester B. Because I am going back to Manual choke and throttle, I believe I don't need the vac adv anymore. Is this true? If so, do I just disconnect the line from the vac adv to the choke and plug the hole?
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | The vacuum advance has nothing to do with the choke or throttle. It advances the timing at the distributor. It is necessary on a stock engine. | | | | | Joined: Nov 2009 Posts: 84 'Bolter | | 'Bolter Joined: Nov 2009 Posts: 84 | Yeah I'm dumb. I had this idea in my head (without looking) that my Rochester B didn't have a vacuum line.
Thanks for putting me back in line. | | | | | Joined: Dec 2005 Posts: 2,557 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 2,557 | You most definitely need the vacuum advance hooked up.
You will no longer need the stove plate and heat tube that hooks to the BC carburetors choke.
Tim
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams." "Look deep before you leap !!!" / "Everything is Everything" "If I say a mouse can pull a house, hitch him up"
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