Vacuum advance on 235 with dual carbs Sorry in advance for asking a newbie question that has probably been asked and answered before. I couldn’t find the answer, so I started a new thread. I’m building a 235 that will go into my 1954 Chevy Bel Air. I’m using a dual carb setup (Fenton intake, dual Carter YB 1-barrell carburetors w/ manual choke that were designed for a 216 but have had the bolt holes drilled out to fit a 235 intake manifold). My question: When attaching the vacuum advance from the distributor (w/ PerTronix Ignitor upgrade), do I attach the vacuum hose to the base of the forward carb?
Do ya 'really' need vac advance ?! (not arguing jus ax'en ) I would think an advance curve to come in pretty quickly would boost HP/torque.... (like all in by 2000RPM or so....IF a manual tranny) 6sally6
Makes no difference. I would put it to the most convenient one usually the front. Remember to plug the rear one if the carbs are the same. If working properly you can see the distributor move in the block when accelerating the carbs.
It is going to have more pep with the advance working, and get better fuel economy. Win win, no down side to having vacuum advance on a cruiser. Having a good advance curve is also a plus. I haven't played with the Carter YB specifically, but the B&B and WA-1 both are ported Vacuum on the carb base. I would check with a vacuum gauge, but both should be equal, so use the one most convenient to distributor. Plug the other one. You could also pull manifold vacuum from the hole in the center of the Fenton, just remember that Manifold Vac is a little different to tune than Ported Vac.
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