Holley 4360 advice

So, I have a holley 4360 carb (4bbl, 450cfm, side hung float) on my 225. This thing used to run good at all angles, but then....I rebuilt it. And when it still didn't run right, I rebuilt it again. And then I realized it was a bad coil > So in all of my rebuilding I must have screwed something up, I know I messed with the float level and maybe tweeked the choke settings, but everthing else was just new seals, gaskets and whatever else came in the kit. It runs fine on the street, but when on the trail and I'm not level, it has a really hard time (too much fuel, lots of smoke in the exhaust) and when it dies, its flooded and maybe it'll restart.

So... Does anyone have any good tips on these carbs. I think they are very similar to a Q-Jet, just a smaller version. Some people say lowering the float is better and same say raise it, anyboy have experience with either? Can anything be done with the vent? Any general advice for this carb would be appreciated.

Thanks

Brian

 

Well, as far as I can tell, the 4360 is a spread-bore Holley. Other than the spread bore, I'd expect it has nothing else in common with the QuadraJet, and is otherwise the same as a 4160. Holleys are very easy to rebuild... If you think you made a mistake rebuilding it, I'd suggest a book like this one: http://www.amazon.com/exec/obidos/t...f=sr_1_1/102-8972190-3934515?v=glance&s=books
Such books are usually available very cheaply used from Amazon or Alibris.

If it worked ok before, I would first check the float level as Lynn suggests. The Holleys with side-hung floats have a tendency to flood out on sidehills. This tendency would be exacerbated id the float's too high. You're probably much better off setting the float way low. Set the idle screws to best lean idle. Not much else to adjust if you put everything back the way it was. Make sure you used the same color and setting for the accelerator pump cam. Raising the bowl vents will help too, but maybe after you get back to where you were.

 

Timgr and Lynn, Thanks for the reply, I'll try lowering the float some more and see what happens. I have the Haynes Holley manul, and its okay for rebuilding, but not really modifying. From the pictures, the 4160 is nothing like the 4360. Haynes says the 4360 is a direct bolt on replacment for the Qjet, but having never taken a Qjet apart, I can't comment on their similarites. Maybe I should get a Qjet book. Anybody have a good Qjet site with tips, tricks, or a least pictures to compare the two?

Is nobody with a :v6: running this carb? Seems to me that if a quadra jet is one of the best offroad carbs (just too big for the 225) then this 450CFM version is about right. I hear they are kind of rare, but you can find them. I've seen rebuilt units on ebay for about $80, but I was looking about a year ago.

 

A QuadraJet uses a completely different design from a Holley, not just external differences. If the 4360 is a spread-bore carb, it will have a different shape body from the 4160 because of the change in the sizes of the throttle bores. Does your carburetor have a power valve? Does it have removable bowls? These are Holley features exclusively. The QuadraJet used a complicated system of tapered rods in oversized fixed jets to change the main jetting - totally different from a Holley in both concept and execution. If you need another book, there are a few books that have chapters specifically about the 4360. IMO you'll be wasting your money buying a QuadraJet book, unless you want to learn about QuadraJets.

 

Well, I went and lowered the float to and it seems to be running much better at angles. Now I just have to play with the mixture a little. And Tim, the 4360 looks almost identical to the Qjet externaly. It has no removeable bowls but it does have a power valve. This may be a good candidate for people wanting to stick with a simple carb that runs similar to a qjet, but in a smaller size more appropriate for a V6. Just a though.

 

Sorry if I seemed brusque in my reply. Glad you're making some progress.

 

Okay guys, here is some pics of the 4360. If anyone has any ideas on how to make this thing run better, let me know. No worries Tim. Your input is appreciated. How is this setup different from the QuadraJet? Externaly is close, but how about the internals?

 

It's a Holly 450 Economaster. I belive these carbs were manafactured in the mid 80's. I ran one(two actualy) for many years. The first was a borrowed unit and ran well. After I returned it, I looked for another to replace it. The second unit I found wouldn't run right no matter what I did to it. It is still sitting in the garage. I've ben running a Qjet for a couple of years on the 'ol Dauntless with excelent results(yea, I know it's WAY overcarbed!) As for the differences, except for the spread bore design, they are totaly different carbs, as stated in earlier posts. If yours ran well before the rebuild, after lowering the float, I would check to see if the power valve is still good, and check to see if the jets are matched to the right bores.