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 The majority of Mustang dual-point...  The majority of Mustang dual-point distributors utilized vacuum advance, as you can see by the diaphragm mounting ears on this Boss 302 distributor body on the left. The 289 high-performance distributor, right, used centrifugal advance, so it didn't need a diaphragm or mounting ears.  Point plates and cams differ...  Point plates and cams differ in the various Mustang distributors. On the left is a single plate used on an all-centrifugal 289 high-performance distributor. At the right is a dual point plate from a Boss 302, which had vacuum advance. Note the taller cam used with the dual plate.  There were four types of vacuum...  There were four types of vacuum diaphragms used on Mustang distributors. From left to right, a single diaphragm used in '65-'67 and on '68-'70 big-block automatics; a dual diaphragm with a cad-plated narrow band as used on 302 two-barrels, '67-'70 FE automatics, and 351 automatics; a dual diaphragm with a zinc-plated wide band as found on all Boss engines, '70 428 CJ four-speeds, and '70-'71 429 CJ four-speeds; and a '72-'73 dual diaphragm (note the position of the front vacuum tube) used on 351 CJ four-speeds and many service distributors. Ulrey has reproduced most of these diaphragms.  Boss 302 distributors have...  Boss 302 distributors have this C80F-12131-A on the side of the shaft housing.  Although this is a distributor...  Although this is a distributor for a '63 427 big-block, it shows the oval style of FoMoCo that was cast into '64 1/2 Mustang distributors.  For '65-'67, the cast FoMoCo...  For '65-'67, the cast FoMoCo was rectangular. The C5GF-A casting number at the upper left indicates this distributor was originally used in a '65-'66 Mustang 289 with four-barrel carburetion and manual transmission. Underneath is the 5LB date code, indicating a build date of the second week of November 1965.  Sometime during the '67 model...  Sometime during the '67 model year, Ford switched to Autolite distributors, which were used through '71. This one is a C80F-J from a '69 Cobra Jet automatic, built on September 9, 1968, as indicated by its 8J9 build date.  In '72-'73, Mustang distributors...  In '72-'73, Mustang distributors were labeled Motorcraft. This one, with casting number D2AF-RA, is actually from a '72 Galaxie. Note the 1K11 date code: October 11, 1971.  Mike Ulrey offers completely...  Mike Ulrey offers completely rebuilt distributors for Mustangs, including rare ones like this Boss 351 version. Parts are also available.
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