Manual choke carb question/brake booster question/Holley carb question
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Manual choke carb question/brake booster question/Holley carb question
Allright, I recently ditched my Edelbrock 1406 and picked up a 650DP. I have yet to run the carb, but it's a manual choke carb. Now, although the car doesn't get run in the winter, it may still get driven on colder days, plus a choke is just a nice thing to have. Anyways, I'd like to rig up something as a pull into the interior, I was thinking of maybe ditching the cigarette lighter and trying to run something right through that hole as a choke pull, that'd look somewhat factory. Has anyone else run a manual choke cable up into their interior?
Also, with the new 650DP, I can't use the vacuum port on the back of my Performer manifold for my brake booster. The rear accelerator pump gets in the way. However, on the carb, there doesn't seem to be anywhere to run it either, so I was wondering what I should do about this?
Finally, on each side of my new carb, there's some scews and i'm not sure what they do. Their right before the fuel bowls, and you can turn them to adjust them. Here's a few pictures of them:
-Thanks for your help, Brandon
Also, with the new 650DP, I can't use the vacuum port on the back of my Performer manifold for my brake booster. The rear accelerator pump gets in the way. However, on the carb, there doesn't seem to be anywhere to run it either, so I was wondering what I should do about this?
Finally, on each side of my new carb, there's some scews and i'm not sure what they do. Their right before the fuel bowls, and you can turn them to adjust them. Here's a few pictures of them:
-Thanks for your help, Brandon
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Re: Manual choke carb question/brake booster question/Holley carb question
You can use a carb spacer to get enough clearance to use the port on the manifold, or you can use a spacer that's drilled and tapped for a vacuum port.
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Re: Manual choke carb question/brake booster question/Holley carb question
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Re: Manual choke carb question/brake booster question/Holley carb question
Not much more than one that doesn't have the port, or you can drill and tap one yourself.
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Re: Manual choke carb question/brake booster question/Holley carb question
Will that be acceptable to use, or should I pick up an actual 3/4" spacer?
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Re: Manual choke carb question/brake booster question/Holley carb question
A spacer isn't any more likely to leak than the carb and intake themselves are. You could use that one, but you might want a four-hole or divided spacer for use with a dual-plane intake.
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Re: Manual choke carb question/brake booster question/Holley carb question
Originally Posted by five7kid
The screws are for adjusting the idle mixture.
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Re: Manual choke carb question/brake booster question/Holley carb question
Allright, turns out I was in my local parts store the other day, they didn't have any 4-hole spacers, but a guy in there overheard and said if I stopped by his house he had a 4 hole phenolic spacer I could have. I figure that 1" will be enough, and then I was told by the guy at the counter that Napa or Advanced Auto should have a 90* bend vacuum attatchment, that with a 1" spacer should clear the accelerator pump/rear fuel bowl just fine. Then I figure I'll have to buy one of those air cleaners with a PCV hook-up and I can run my PCV off of that, so that whole problem is sorted out.
Now, does anyone have picture of a choke cable run into their interior? I'd be curious to see where people went through and how it looks.
Now, does anyone have picture of a choke cable run into their interior? I'd be curious to see where people went through and how it looks.
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Re: Manual choke carb question/brake booster question/Holley carb question
The air cleaner would be the PCV's fresh-air source. You still need a PCV vacuum port on the carb.
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The big port on the back goes to the PCV valve. You'll have to use a manifold port for the power brake booster.
The idle adjustment screws can be turned out one turn for a start.
The idle adjustment screws can be turned out one turn for a start.
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Re: Manual choke carb question/brake booster question/Holley carb question
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Re: Manual choke carb question/brake booster question/Holley carb question
it would be under the float bowl, on the base plate. i've seen some that don't have it though. lift the carb up and take a pic. the pic you have is the wrong angle.
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Re: Manual choke carb question/brake booster question/Holley carb question
It has the pilot hole cast-in, but not machined for the port
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Re: Manual choke carb question/brake booster question/Holley carb question
One of the Holley guys could tell you if you can just drill the base.
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Re: Manual choke carb question/brake booster question/Holley carb question
The round dimple in the center of the carb base underneath the float bowl.
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No, but the base doesn't appear to be Holley, nor do the idle mixture screws. The primary metering block is missing the timed vacuum port, the fuel bowls appear to have been painted, the clear site plugs aren't stock Holley.
{I can't reload the picture of a Proform body. You'll have to search (using Google) for it.}
{I can't reload the picture of a Proform body. You'll have to search (using Google) for it.}
Last edited by five7kid; 10-02-2007 at 07:28 PM.
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Re: Manual choke carb question/brake booster question/Holley carb question
When I put the double pumper on my RPM intake, I just drilled and tapped one of the EFI bosses on the intake runners for a vacuum fitting. I used a 1/8" pipe thread, and a fitting that has a 1/8" thread on one side, and a 3/8" hose barb on the other. Works great! EFI bosses are probably the best place for that because its cast really thick there. Makes for lots of threads for the fitting. So I use the fitting on the #6 intake runner for brakes and the port on the back of the carb for PCV, and plugged the hole in the manifold behind the carb. So far, so good
(You need a 1/8" NPT tap for this btw, not a standard 1/8" tap)
Five7 - those are Holley idle mixture screws... I have a set just like those
(You need a 1/8" NPT tap for this btw, not a standard 1/8" tap)
Five7 - those are Holley idle mixture screws... I have a set just like those
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Re: Manual choke carb question/brake booster question/Holley carb question
Nope, ebay.
Actually that was one of my first thoughts when I got it, it's all polished, which I wouldn't expect from a stock Holley. However, it has a choke, and if I recall don't the Proform bodies come without a choketower? If you guys want I can get as many pictures as needed to verify the type of carb body/base plate it is.
Do you happen to have a picture of this? I'm not sure where "EFI bosses" would be.
Also, I'm going to use this fitting here: http://store.summitracing.com/partde...?part=EDL-8096
To run my brakes off of. With the spacer it should be just fine. However, do I want 1/8 NPT thread for the stock Edlebrock intake threads? Also, it says 3/8" NPT threads on the outlet, wherewould I get a fitting to thread into that 90* elbow and then have a barb hose fitting or whatever on the end for my power brakes?
-Thanks, Brandon
Originally Posted by Apeiron
Proform body?
When I put the double pumper on my RPM intake, I just drilled and tapped one of the EFI bosses on the intake runners for a vacuum fitting.
Also, I'm going to use this fitting here: http://store.summitracing.com/partde...?part=EDL-8096
To run my brakes off of. With the spacer it should be just fine. However, do I want 1/8 NPT thread for the stock Edlebrock intake threads? Also, it says 3/8" NPT threads on the outlet, wherewould I get a fitting to thread into that 90* elbow and then have a barb hose fitting or whatever on the end for my power brakes?
-Thanks, Brandon
Last edited by '86 350; 10-02-2007 at 10:07 PM.
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Re: Manual choke carb question/brake booster question/Holley carb question
Originally Posted by Air_Adam
When I put the double pumper on my RPM intake, I just drilled and tapped one of the EFI bosses on the intake runners for a vacuum fitting.
Originally Posted by '86 350
Do you happen to have a picture of this? I'm not sure where "EFI bosses" would be.
Also, I'm going to use this fitting here: http://store.summitracing.com/partde...?part=EDL-8096
To run my brakes off of. With the spacer it should be just fine. However, do I want 1/8 NPT thread for the stock Edlebrock intake threads? Also, it says 3/8" NPT threads on the outlet, wherewould I get a fitting to thread into that 90* elbow and then have a barb hose fitting or whatever on the end for my power brakes?
-Thanks, Brandon
Also, I'm going to use this fitting here: http://store.summitracing.com/partde...?part=EDL-8096
To run my brakes off of. With the spacer it should be just fine. However, do I want 1/8 NPT thread for the stock Edlebrock intake threads? Also, it says 3/8" NPT threads on the outlet, wherewould I get a fitting to thread into that 90* elbow and then have a barb hose fitting or whatever on the end for my power brakes?
-Thanks, Brandon
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Re: Manual choke carb question/brake booster question/Holley carb question
If that Summit link you posted was the low profile Edelbrock fitting, it won't help with a DP, only the vacuum secondary carbs. Don't bother if your carb is a double pumper.
Here is a pic of mine - sorry its so big, but its the only way to see what I did. Look under the throttle bracket, you'll see the 90* fitting on the last runner, just near the valve cover. Thats where I put my fitting, and it works just fine.
All the big round things on the runners near the valve cover are the EFI/Nitrous bosses... thats the best place to tap for a fitting, since its cast quite thick there. I would not recomend putting the fitting on the #8 or #6 runner like I did though, its just sort of a pain in the *** with the throttle bracket there too (I didn't think about it much untill afterwards).
It works great though... its really the only 'proper' way to do it so you can use a DP carb on an RPM intake under a stock hood.
Here is a pic of mine - sorry its so big, but its the only way to see what I did. Look under the throttle bracket, you'll see the 90* fitting on the last runner, just near the valve cover. Thats where I put my fitting, and it works just fine.
All the big round things on the runners near the valve cover are the EFI/Nitrous bosses... thats the best place to tap for a fitting, since its cast quite thick there. I would not recomend putting the fitting on the #8 or #6 runner like I did though, its just sort of a pain in the *** with the throttle bracket there too (I didn't think about it much untill afterwards).
It works great though... its really the only 'proper' way to do it so you can use a DP carb on an RPM intake under a stock hood.
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Re: Manual choke carb question/brake booster question/Holley carb question
I figured PCV could be done off of the EFI bosses in the intake after I drilled it, and then I could run the brakes off of a 90* vacuum fitting out of the back of the intake. Wouldn't that work just fine?
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Re: Manual choke carb question/brake booster question/Holley carb question
Don't put the PCV in a runner or you'll make that cylinder run lean.
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Re: Manual choke carb question/brake booster question/Holley carb question
The RPM is a pretty tall manifold... I seriously doubt it will clear the hood even with doubled up base baskets, let alone a carb spacer, lol. I had to change my air cleaner wingnut for a regular nut because its 'wings' rubbed on the hood. I have no spacer either.
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Re: Manual choke carb question/brake booster question/Holley carb question
Put the POWER BRAKE hose on the runner, and PCV hose on the back of the carb. It works just fine that way.
The RPM is a pretty tall manifold... I seriously doubt it will clear the hood even with doubled up base baskets, let alone a carb spacer, lol. I had to change my air cleaner wingnut for a regular nut because its 'wings' rubbed on the hood. I have no spacer either.
The RPM is a pretty tall manifold... I seriously doubt it will clear the hood even with doubled up base baskets, let alone a carb spacer, lol. I had to change my air cleaner wingnut for a regular nut because its 'wings' rubbed on the hood. I have no spacer either.
And I already mentioned, there's no vacuum port on the back of my carb. My options are either drilling/tapping a hole in one of the EFI bosses and running my power brakes off of that and then running my PCV off of the vacuum port in the intake BEHIND the carb. Will this work?
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Re: Manual choke carb question/brake booster question/Holley carb question
And I already mentioned, there's no vacuum port on the back of my carb. My options are either drilling/tapping a hole in one of the EFI bosses and running my power brakes off of that and then running my PCV off of the vacuum port in the intake BEHIND the carb. Will this work?
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Re: Manual choke carb question/brake booster question/Holley carb question
Gee thanks. You never answered my question. I don't have a port on the back of my carb, I have one on the back of my manifold however. I have no problem drilling into a runner, but I can't run my PCV off of there.
My other option is a spacer with a vacuum port in it, but they only make open ones, and that's gonna kill my low-end.
My other option is a spacer with a vacuum port in it, but they only make open ones, and that's gonna kill my low-end.
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Re: Manual choke carb question/brake booster question/Holley carb question
Gee thanks. You never answered my question. I don't have a port on the back of my carb, I have one on the back of my manifold however. I have no problem drilling into a runner, but I can't run my PCV off of there.
My other option is a spacer with a vacuum port in it, but they only make open ones, and that's gonna kill my low-end.
My other option is a spacer with a vacuum port in it, but they only make open ones, and that's gonna kill my low-end.
I said yes to your suggestion of running the PCV off the port on the manifold and brakes off a newly-made hole in a runner.
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