I have an unusual four barrel Holley 4160 carb with mechanical secondary's, List 4005-s. My question is, does it come with or without a vacuum secondary canister since it has the mechanical linkage? From what I have been able to find out was this carb was used on the 65-68 289 and 302 engines. Where can I purchase vacuum secondary diaphragms with the short stem for Holley carbs? Thanks
There's no point for a vac can with mech sec . You could probably pick up a vac sec carb for what it would cost to change yours & that would be a project ( different linkage etc)
Only Holley carb that I’m aware of came on 289-302’s were on Shelby’s. All the Ford small block 4bbl were Autolites and were vacuum secondaries.
Quite a few performace Ford engines had Holley carbs from the factory, I know Boss 302, 429, CJ428’s etc. had them, the factory tri power set ups also used them. The carb in question is probably worth some cash to a restorer especially if it has the tag on it.
Some late 70’s big Ford cars used the Holley 4160 carb, they were also used on 352-390-406-427 engines in different configurations also. I’ve never seen one from the factory on a small block though. Should be easy to get parts for them as Holley still produces them.
Here’s some info with photos of the carb in question, it definitely was designed as a vacuum secondary carb. Can you post photos of yours? Photo and information credit to Carbs Unlimited. Here’s a photo of the List #4224 carb, does your secondary linkage look like this? If so the throttle plate was changed and their is no benefit to having that on your carburetor.
I should have mentioned, I have been restoring and rebuilding carburetors for 25 plus years and have never seen a carburetor like this. I haven't had much luck finding information for this carb, but I really don't think it needs the vacuum canister. That is why I'm here hoping to get an answer from some smart people. Here's some pictures. Buy the way, Allstate had what I needed. Thanks
so you are curious about the direct link on the secondaries? Perhaps it is a kit that was installed long ago, to do away with the vacuum can to make the carb into a fake double pumper, but without the secondary pump? That linkage does not look like Holley stuff.
Like Squirrel said, I also do not believe that looks like a Holley setup. It's almost like what we used to do with a small machine screw and nut in the slotted link.
I believe it's Cal Custom. Somewhere in all of my junk, I've got a new conversion kit like that in vacuum formed plastic on a cardboard backing.
I believe that a 50 cc accelerator pump was the trick for making this work. And then juggling squirters to help delay that huge shot of fuel, to cover the bog that was the usual result of just making the secondaries mechanical. Vacuum secondaries open slowly enough to avoid that bog.
Yeah, it's a "solution" to a problem that should be solved by other means. Generally, if you want better throttle response from a vacuum secondary carb, you should put a lighter spring in the vacuum can. Eliminating the vacuum mechanism just messes things up, but it also made Cal Custom some money, from*****ers who don't understand how the carb was designed to work.
As a rule of thumb: Heavier cars, automatic transmissions, lower stall converters, higher axle ratios, work better with vacuum secondaries. Lighter cars, manual transmissions, auto trans with higher stall speeds, lower axle ratios, seem better suited to mechanical secondaries.
And Holley for selling lots of 50 cc conversion kits. Which by the way, were a lot more expensive than a couple of vacuum canister springs.
Still remember the part number for the spring kit, 20-13. Sold several when I worked in a parts store.
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