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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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#65865 09/17/2006 9:24 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | There are two places to draw vacuum for the distributor-
Off the manifold directly- That is "unported"
Off the carb- ported. the vacuum fitting reccomended by Langdon on the Motorcraft 740 (Carter Webber) is the one on the right of the mixture screw and above it. It is directy to the right of the where the idle shutoff solenoid (#11) would be, but is plugged for use on these trucks.
Langdon's instructions are to try both ported and unported to see which one works better.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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