I've got a Holley 4bbl on my 4-port 13B but am having problems. It reeks of gas and gets 8 mpg, then today produced a gasoline slick when parked facing downhill. I imagine a rebuild is in order, but I've got a Dellorto that I'd like to replace it with anyway, assuming I can rebuild it.

The Dellorto seems to be in decent shape but I'd like to know that all the gaskets are new and would like to clean it up a bit too - not polish, but clean. What's the best way to clean up a carb good? I'd think it could use a soak, but I don't have any solvent, so what do y'all use? I'm not sure it needs a rebuild, but it can't be a bad idea, right?

As for the Holley, I've checked for carb numbers at Carl's suggestion, but can't find one that will cross-reference with any of the carb lists on Holley's website. Where is the carb model no? If the Dellorto's gonna take a while, how would I go about patching up the Holley to run in the mean time?

 

Don't know about the holley, But the Dellorto isn't hard to rebuild at all. What size Dell is it, and is it an RB modified one or just regular? If it's modified, be careful of the spacer/gasket on the accelerator pump, It might be cracked and there is nowhere to get a new one. Better yet if the ac pump is working fine I would leave it alone. and as for cleaning, just use a can of carb cleaner, That's what I did and it came out clean as a whistle and didn't take much elbow grease either.

 

I know the Dell came on a RB manifold, so I'd imagine it's an RB modded setup - again, how could I tell? It's a DHLA 48. Do you just hose it down with carb cleaner, and that's it? What jets are you running on your Dell, Rotor, and is there any way to know what's in mine?

 

you must have the single pumper holley. anyways, its not hard to change. remove the 4 screws in the fuel bowl. Go to a high performance shop and tell them that you want a reusable fuel bowl gasket, reflon o-rings for screws, and o-rings for the tube that runs from left to right fuel bowls. Pay attention to the tube during installation as a little screw up will cause a gas leak.

there are several styles of fuel bowl gasket. Be sure that you have the right one.

 

The Holley model number is on the back, top part of the carb. If you look at the top of the carb, then locate the side of the butterfly housing that's taller then slopes down, it's on the back of that. Etched into the casting will be a 4 digit number and a dash then another single digit number. It's kind of hard to see, but it should be there. Might be something like a 1801-5 or 1848-1, etc...
So far as the DHLA carb goes. You can determine your main jet, air jet, emulsion tube, and idle jet sizes by removing the little bonnet on the top middle of the carb and unscrewing the jets.

 

Are the jets etched with their sizes then? It's too late to check the carb now, but thanks SO much. I'm curious what size it is and definitely need some gaskets, so maybe she'll be running by the weekend.

Are Dellortos simple enough that even if you don't know that you need a rebuild, it's still a good idea? It seems like it to me, if it's not too problematic.

 

So, I got the only number on the carb on the primary side. There's a 2405, and I can't find it on Holley's website. The choke linkage slips behind a black disc that's marked "LEAN --->" in a circle, which I think is for an electric choke There's no choke hooked up so far as I can tell. Any idea how to hook it up or find support for this thing? I'd like to keep it running but just don't know what to look for. With a bad fuel leak, I'd think that the float gaskets need to be replaced, but I'd also like to just know what's on my engine, ya know?

How can you tell a single-pumper from a double-pumper?

 

As for the dellorto, there are some very good Dellorto carb guys on this forum including myself. If the carb hasn't been rebuilt in the last 5 years then odds are it needs it The rebuild kits are not expensive and it'll save headaches down the road. I've seen the most amazing amount of CRUD in the bottom of a dellorto disintegrate and plug carb jets at the most inoppertune times. So rebuild it before installing.

As for the extra thick accelerator pump gasket the Racing Beat put on the carb to increase the "bowl" of fuel in the accelerator pump resivoir, I've made my own out of 3/16" thick gasket material. From Ace Hardware in the plumbing section. Works groovey.

Dellorto jets do have their size stamped on the side of them.

If you put the Dellorto on the bridgeport 13b I have some baseline jetting for a Dell on a 12a J-Bridge with Lake Cities intake manifold. Just PM me.

Sorry, can't help with the Holley. Never worked on one!