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By Florida_Phil - 5 Years Ago
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I occasionally see Y-Block Holley Roto-Vance distributors for sale on EBay. They look to be all centrifugal advance. Some have dual points. Are they usable? Are parts a problem? Can they be converted to Pertronix? Thanks!
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By KULTULZ - 5 Years Ago
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I occasionally see Y-Block Holley Roto-Vance distributors for sale on EBay. They look to be all centrifugal advance. Some have dual points. Are they usable? Are parts a problem? Can they be converted to Pertronix?
Both HOLLEY and MALLORY offered this style DIST for a true period performance engine. It was a centrifugal advance only (one way to beat LOAD-O-MATIC). It would be hard on fuel mileage on the street.
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By Florida_Phil - 5 Years Ago
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Back when I was first learning to drive, my father bought a used 1957 Ford Custom 300. I used to drive it on dates. This Ford had a 272 with an automatic. I would look at the engine often and I remember it having a Holley distributor. It must have been a Roto-Vance. I also remember my father swapping it out for a stock Ford distributor. Gas mileage must have been the problem?
I assume these distributor use a standard Ford cap? If you are looking for totally mechanical advance Y-Block distributor, is a Roto-Vance a decent option?
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By Robs36Ford - 5 Years Ago
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They have vacuum advance.
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By Florida_Phil - 5 Years Ago
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They have vacuum advance.
I don't see the vacuum advance canister. Am I missing something?
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By Robs36Ford - 5 Years Ago
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Not a canister, it is built into the advance. See the brass fitting in your pic, that is for the vac line.
Not to be used with the Holley 4000 (Teapot) carb without removing the Spark Control Valve and doing the mod Posted on this site for 57 and later Distributors.
The Roto-Vance came out in 1958 and were also available for many other engines.
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By KULTULZ - 5 Years Ago
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They have vacuum advance.
Where?
I think the confusion is here -
HOLLEY was the primary vendor for IGN and CARB for years. LOM and Dual Advance was their design. FOMOCO bought and used. HOLLEY also made regular a DIST with the HOLLEY logo. Also made were DIST for Heavy Truck that was centrifugal but received a manifold vacuum signal for a governor. They also designed the FORD 2100 and 4100 Series carb.
The HOLLEY centrifugal DIST took a HOLLEY DIST cap and points. Same with MALLORY.
I see no advantage of using one over a modified DUAL ADV (63/64 LT) unless the vacuum canister will not clear the intake you are planning on using.
CORRECTION -
As I have been corrected to realized it can operate off ported/manifold vacuum (not SPARK CONTROL VALVE), it seems a logical choice to use with the EDL 8V intake if clearance is an issue.
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By KULTULZ - 5 Years Ago
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Not a canister, it is built into the advance. See the brass fitting in your pic, that is for the vac line.
Not to be used with the Holley 4000 (Teapot) carb without removing the Spark Control Valve and doing the mod Posted on this site for 57 and later Distributors.
The Roto-Vance came out in 1958 and were also available for many other engines.
THANK YOU!
I stand corrected-
It also shows FORD IGN parts.
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By Florida_Phil - 5 Years Ago
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Were the Mallory distributors all centrifugal advance? I avoided them back in the day. I understand caps and parts are expensive? Is there any all centrifugal advance Y-Blocks distributors still available new?
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By Robs36Ford - 5 Years Ago
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From the Holley CARBOGRAM July 1958
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By Florida_Phil - 5 Years Ago
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Got it. Thanks for the information. I am searching for a full centrifugal advance Y-Block distributor.
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By KULTULZ - 5 Years Ago
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Florida_Phil (11/25/2019)
Got it. Thanks for the information. I am searching for a full centrifugal advance Y-Block distributor.
Read This - https://www.ctci.org/mallory-distributor/
My understanding is the HOLLEY vacuum advance can be blocked off. Any chance I have this right?
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By 2721955meteor - 5 Years Ago
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purchased the holley cent advance only on eBay ,instaled on 55 mer 292 it works well(has dual points.no vacume lines. never asked him about fuel consumption. only comet was what a difference from loadematic
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By FORD DEARBORN - 5 Years Ago
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Florida_Phil: This one will work fine as is because it's geared for a Ford Y-block. Usually these iron truck stribs with governor ports are for Lincoln Y-blocks. That being said, I have replaced the Lincoln driven gear with a Ford Y-block gear pined in the proper position and they work well. That is, if you don't mind an iron strib. The governor ports can simply be plugged and these stribs use the standard Ford 8 cylinder cap. It has the typical Ford points so Pertronix shouldn't be an issue either. Not sure what degree advance cam is in it but you would have to deal with that later if need be. This one seems to be in excellent condition, rebuilt or new? It's not mine and I don't know the seller but if I can be of further help, let me know. JEFF........... .https://www.ebay.com/itm/1960-1963-FORD-F-500-F-600-F-700-TRUCK-292-V8-DISTRIBUTOR-REMAN-FOMOCO/142030720713?epid=1678249551&hash=item2111b0cec9:g:3xAAAOSwnFZXXG2F
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By Genuinerod - 5 Years Ago
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The MSD 8383 distributors can be used with or without vacuum advance. Paper work that comes with the distributor shows how to adjust for different curves with or without vacuum.
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By Florida_Phil - 5 Years Ago
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I have run my 1957 Ford distributor both with and without the vacuum advance connected. Drivability and idle seem to be better with the vacuum line connected. There is no difference in total advance. The issue is clearance with the FM255 dual quad manifold. I suspect I can engineer around that by relocating the distributor and wires. It would be nice if someone made a "HiPo Style" Y-Block distributor without vacuum advance. I guess not.
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By KULTULZ - 5 Years Ago
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purchased the holley cent advance only on eBay ,instaled on 55 mer 292 it works well(has dual points.no vacume lines. never asked him about fuel consumption. only comet was what a difference from loadematic
The advertisement that was shown shows a model for 55/56 LOM (D-1527AA). Maybe being completely centrifugal was the way to get around LOM?
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By Lord Gaga - 5 Years Ago
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It is a dual advance distributor! See that brass fitting? I run one on a 322" Y, Very good unit.
KULTULZ (11/25/2019)
I occasionally see Y-Block Holley Roto-Vance distributors for sale on EBay. They look to be all centrifugal advance. Some have dual points. Are they usable? Are parts a problem? Can they be converted to Pertronix?
Both HOLLEY and MALLORY offered this style DIST for a true period performance engine. It was a centrifugal advance only (one way to beat LOAD-O-MATIC). It would be hard on fuel mileage on the street.
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By 57RancheroJim - 5 Years Ago
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I would think relocating the orientation of the distributor to move the vacuum can would be the best. But if you aren't tuning for mileage and just want mechanical advance why not just remove the vacuum unit and lock the advance plate in place?
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By KULTULZ - 5 Years Ago
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It is a dual advance distributor! See that brass fitting? I run one on a 322" Y, Very good unit.
The poster described his for a 55 as with no vacuum signal. If you notice on the ad, there are several models listed for different applications. The service manual I showed was for reference only. It does not cover the LOM replacements.
What I am wondering is did the 55/56 model (D-1527AA) come thru centrifugal only or did the vacuum source need modification? Most likely will have to find an original catalog.
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By Lord Gaga - 5 Years Ago
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"Most likely will have to find an original catalog."
An instruction manual is what you need. You'll see how the advance mechanism works! It's different to say the least and very innovative.
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By charliemccraney - 5 Years Ago
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I have a Holley master parts catalog that might have that info. I'll look if I remember.
MPCs and service manuals are often on eBay.
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By Robs36Ford - 5 Years Ago
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The Service sheet has the D1527AA for a 272 engine.
It would be interesting to know what instruction there was to bypass the Spark Control circuit of the carb.
-- I would think just not connecting the vacuum line to this it will work as centrifugal. Just not a good off the line compensation.
This photo shows how the weights and vacuum is assembled. (BTW I read somewhere but I do not know the vacuum canisters are leather! )
As you can see the Advance can be adjusted a small amount through the little cap on the left side here and turning the nut to shorten the travel or lengthen it for the diaphragm.
There is another model that followed the 13xx as in the service book (shown above). It is the 1400. It has a green label instead of the black. It is for all the Ford Lincoln Merc Engines 1955-1960. It is very much the same except how the weights and vacuum diaphragms are made - assembled in one part instead of separate pieces.
R
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By KULTULZ - 5 Years Ago
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THANX! for sharing this info -
How did HOLLEY differentiate between the LOM vacuum signal (modified manifold and DUAL ADVANCE vacuum signal (ported vacuum). especially if one DIST MODEL was used across the PASS CAR LOM design cut-off (1956)?
So all models were DUAL ADVANCE design?
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By charliemccraney - 5 Years Ago
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My MPC is no help for this one.
I don't even see D-1527AA listed in the table of contents but it only goes to 1956. I also don't see it in the 1957 Condensed Catalog, neither as a current item or supersession. Nor do I see it in the Master Price List. These last two are dated Feb. 15,1957. Maybe that distributor was newer in the product line than February 15 1957.
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By KULTULZ - 5 Years Ago
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It wouldn't be listed in the FORD MPC as it was aftermarket. D-1527AA is the HOLLEY PN.
You need a HOLLEY carb catalog of the period.
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By charliemccraney - 5 Years Ago
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Seems odd that a master parts catalog would not have it. Different price lists and condensed catalogs, too?
Oh, I don't have a Ford MPC. It is a Holley MPC that I am looking at.
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By Robs36Ford - 5 Years Ago
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I cannot find an instruction sheet for the Rotovance for applications before 1957 but on my '56 312 it is connected to manifold vacuum. The FORM B235 Service Manual pictured above only really shows the Governor model 1352 and the 1348 and very little of the 1324. I have never seen, or any reference to, a service manual for the 1324 or 1400. The 1324 and 1400 are both vacuum advance and Dual Point. I do not have any specification sheets of the 1348 nor the 1352, I believe they may not have dual point and one or both likely does not have vacuum advance (1352?) as it is used to control the Governor.
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By KULTULZ - 5 Years Ago
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Sorry about that Charlie ...
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By KULTULZ - 5 Years Ago
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The D-1527AA was both centrifugal and vacuum -
Found on this thread - http://forums.y-blocksforever.com/Topic69942.aspx
This is two holes in the hull of my battleship but I am learning.
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