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

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.

So there's no other option huh? About how much do those spacers run that are pre-tapped for vacuum?

Not much more than one that doesn't have the port, or you can drill and tap one yourself.

Well, I've got a spreadbore Performer manifold, and then squarebore 650DP. I've been told I don't have to run an adaptor with the Performer manifold, but I do have one here. I have this one: http://store.summitracing.com/partde...5&autoview=sku Are thsoe adaptors known to have vacuum leaks at all?

Will that be acceptable to use, or should I pick up an actual 3/4" spacer?

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.

The screws are for adjusting the idle mixture.

Allright, yeah I used to run this spacer with my Edelbrock carb, and it seemed to kill my low-end.


Allright thanks, do you know what a good starting point for them would be? Like how many turns out?

That's exactly what I would expect to happen. It negates some of the benefit of a dual plane manifold.

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.

The air cleaner would be the PCV's fresh-air source. You still need a PCV vacuum port on the carb.

There's no port on this carb though.....

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.

Allright thanks a lot.

Allright, maybe i'm just retarded, but there doesn't seem to be an vacuum port on the back of this carburetor.

Here's a picture:

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.

Hopefully this is the angle your looking for:

It has the pilot hole cast-in, but not machined for the port

So basically there's no way to run a PCV right now unless I were to get a spacer with a vacuum port in it?

One of the Holley guys could tell you if you can just drill the base.

I'm still confused, where would I even drill? I don't see where the casting is for a vacuum port.....

The round dimple in the center of the carb base underneath the float bowl.

This didn't come in a Holley brand box, did it.

Proform body?

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.}

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

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

bump.

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.

It should work fine if I run a carb spacer shouldn't it? It'll clear and everything. I need to run a second fitting somewhere, like I mentioned earlier, my carb doesn't have a vacuum fitting on the back of it like some do, so I need somewhere to run my PCV, and somewhere to run my brake booster.

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?

Don't put the PCV in a runner or you'll make that cylinder run lean.

Damn. What are my options for running it then? Do I go into the vacuum port behind the carb or what?

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.

I'm running a regular Performer manifold, not the RPM version, my version has a lower profile. It cleared my hood just fine when I was running the Performer, Edelbrock carb, and a 3/4" spacer with a 3" drop base air cleaner.

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?

Anyone?

Yes.

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.

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.

Allright.