HD292 Distributor?
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Junior User
Joined: Dec 2010
Posts: 98
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From: Port Orchard, WA
HD292 Distributor?
I have a 57 F600 M&H with the 292HD that I am restoring. I got it running very good and drove it today for the first time in 48 years. When I was setting the timing, I noticed that it as two vacuum lines. There is a vacuum line going from the RH base plate of the carb to the Dist body and a vacuum line going from the LH body of the carb to the dist shaft housing. I assume that there is no internal vacuum advance.
Also, It has a 1959-1960 governor Holley list 2022 on it. it idles great but it has a horrible flat spot in the mid-range. It could be a power valve issue and I can fix it. However, I have a rebuilt Holley 390 list 8007 that I converted to manual choke.
My questions are;
1: What do the vacuum lines control in the dist?
2: Since I will never work the truck hard, is the 390 a better choice?
3: If I replace the carb, will this dist work fine or should I opt for a vac advance style instead?
Also, It has a 1959-1960 governor Holley list 2022 on it. it idles great but it has a horrible flat spot in the mid-range. It could be a power valve issue and I can fix it. However, I have a rebuilt Holley 390 list 8007 that I converted to manual choke.
My questions are;
1: What do the vacuum lines control in the dist?
2: Since I will never work the truck hard, is the 390 a better choice?
3: If I replace the carb, will this dist work fine or should I opt for a vac advance style instead?
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
I think you should change out the carb and dist.
I have a carb that used to be like what you have.
This one used to have a governor, plus a hand throttle. With a LOT of work, including fabing accelerator cam and linkage, still dont know if it will turn out useable. There is no ported vacuum, and to remove the unwanted items the throttle shaft had to be cut flush with the body, eliminating poss. for choke.
I am helping a friend's son with his '62 GMC short body school bus. It has an SBC with governed carb. We are going to change out to a non governed carb. Dont know yet what will be done about the distributor.
I have a carb that used to be like what you have.
This one used to have a governor, plus a hand throttle. With a LOT of work, including fabing accelerator cam and linkage, still dont know if it will turn out useable. There is no ported vacuum, and to remove the unwanted items the throttle shaft had to be cut flush with the body, eliminating poss. for choke.
I am helping a friend's son with his '62 GMC short body school bus. It has an SBC with governed carb. We are going to change out to a non governed carb. Dont know yet what will be done about the distributor.
Thread Starter
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Junior User
Joined: Dec 2010
Posts: 98
Likes: 3
From: Port Orchard, WA
I read your thread, it was very interesting. It was the reason why I was thinking about installing the 390CFM.
Any ideas what the two vac lines to the distributor are for. It's obviously a mechanical advance only distributor.
Any ideas what the two vac lines to the distributor are for. It's obviously a mechanical advance only distributor.
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
I dont know. That is pretty much the same reason I said we dont know what will be done on the dist. for the GMC. If I owned the bus the dist. would get replaced. The owner(s) think they can just plug the unused dist. vacuum ports. We will see what happens when the carb is in place and timing light is used.
Logistics Pro
Joined: Feb 2005
Posts: 3,952
Likes: 117
From: Upper Left Coast
I am using a newer style dist (with Pertronix inside) and I bought the following carb for mine. (complete with their throttle position sensor)
Holley Performance Products 390 CFM Four Barrel Street Carburetor 0-8007
It's their 390CFM model.
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Junior User
Joined: Dec 2010
Posts: 98
Likes: 3
From: Port Orchard, WA
Marc,
I am using a newer style dist (with Pertronix inside) and I bought the following carb for mine. (complete with their throttle position sensor)
Holley Performance Products 390 CFM Four Barrel Street Carburetor*0-8007
It's their 390CFM model.
I am using a newer style dist (with Pertronix inside) and I bought the following carb for mine. (complete with their throttle position sensor)
Holley Performance Products 390 CFM Four Barrel Street Carburetor*0-8007
It's their 390CFM model.
What jets do you have in the primary's? Mine has 51's in it.
Elder User
Joined: Jun 2008
Posts: 693
Likes: 6
From: N E Ohio
The two lines to the distributor are for the governor. One line is vacuum from the carb to the distributor, the other is vacuum from the distributor to the governor. When the distributor shaft rotates above the governed speed, the regulating mechanism in the distributor applies vacuum to the governor to reduce throttle opening.
A distributor from a 292MD should work if you change the carb from a governed model to a regular model. Only potential issue is if you have a mechanical tach, the 292MD distributor has no provision for a tach drive.
A distributor from a 292MD should work if you change the carb from a governed model to a regular model. Only potential issue is if you have a mechanical tach, the 292MD distributor has no provision for a tach drive.
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Junior User
Joined: Dec 2010
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From: Port Orchard, WA
Put the 390CFM on it, disconnected and capped the vac ports on the dist. Took it for a spin and it runs like a champ. No more flat spot in the mid range and it idles very smooth at 600 RPMs. I then came home and bumped the timing up from the 5 degrees intial to 12 degrees. The total is now 34 degrees. Drove it again and it runs even better and no detonation on reg fuel.
Anyway, one project done and moving on to another. Thanks for the help everyone.
Anyway, one project done and moving on to another. Thanks for the help everyone.
Logistics Pro
Joined: Feb 2005
Posts: 3,952
Likes: 117
From: Upper Left Coast
Put the 390CFM on it, disconnected and capped the vac ports on the dist. Took it for a spin and it runs like a champ. No more flat spot in the mid range and it idles very smooth at 600 RPMs. I then came home and bumped the timing up from the 5 degrees intial to 12 degrees. The total is now 34 degrees. Drove it again and it runs even better and no detonation on reg fuel.
Anyway, one project done and moving on to another. Thanks for the help everyone.
Anyway, one project done and moving on to another. Thanks for the help everyone.
That makes me feel good that the new Holley 390 I'm putting on mine will run well!
I'm going to have an electric choke though....
4wd Low
Joined: Aug 2024
Posts: 10
Likes: 2
I know this post is so old now, but this is about the only thing I have found on the internet about this distributor and carb setup that someone actually followed up on. I am working on a 61 firetruck (332 lincoln) and am having carb issues. Wanting to put a new carb but didn't know what to do with those vacuum lines to the distributor/governor. Shout out for responding.
Tuned
Joined: Aug 2003
Posts: 346
Likes: 0
From: Eastern Virginia
I know this post is so old now, but this is about the only thing I have found on the internet about this distributor and carb setup that someone actually followed up on. I am working on a 61 firetruck (332 lincoln) and am having carb issues. Wanting to put a new carb but didn't know what to do with those vacuum lines to the distributor/governor. Shout out for responding.
4wd Low
Joined: Aug 2024
Posts: 10
Likes: 2
I’ve read that the ford y block distributor work in the Lincoln y block if the distributor gear is changed. I’ve considered a new dizzy, but I’ve tinkerer with mine enough thst I’ve got it running pretty good now.
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