I am planning a four carb. Holley 94 setup on a mildly built Olds 303. Can't seem to get a consensus on using the power valves or block them. Also jet size. I am looking at straight linkage, sea level cruising (driving), manual trans. Also, were all the three bolt 94s cast the same? I have two "2100" and one with only "Ford" embossed on the float bowl. I am looking for a 4th.
I may have a 2100 in stock if interested. have you chatted with Vintage Speed in Vero Beach. He may be able to help or a pm to Dickster in Tx might get you some info as he builds induction systems. @carbking might be able to offer some advice as well.
Getting a consensus on power valves / no power valves may be difficult. Personally, I would use power valves on anything except a trailered race car. We even built Rochester two-barrel trailered race car carbs using power valves with great success. Jetting is more straight-forward. First, make certain that all four are exactly the same. Now look up the factory Holley specifications for these exact carburetors, and use these exact calibrations as a starting point. Now you have a repeatable base-line. Jon.
Theres quite a range of the '94', the throttle blade size is different and you'll want to avoid the ones with a 'spark valve' that looks like a power valve sticking out from the base plate. If I were doing it, I'd get the early 94's with the smaller throttle blade, it'll give a better vacuum signal for the fuel flow, the cfm to the engine will be the same as a larger throttle blade but with smaller blade the flow will be quicker and carbs like a strong, positive signal. I'd block the power valve, with 4 of them they all won't work exactly the same and the fuel delivery will be upset/uneven, like the left rear cylinders could be rich while right front two be lean. Even in a 4bbl it is rare to see PV in both front and rear bowls, they don't always work together, PV are not 'On/Off' valves, they have a bit of an operating range and come fully open at the rating, a 6.5 starts closing at an 1" and continues as vacuum increases to 6.5" when its closed. They aren't all that accurate. You are picking a good carb to do a cluster with, they are simple and well developed.
The first thing I'd do is get 4 IDENTICAL carbs. This "Mix & Match" thing is just asking for trouble, no matter how good the carbs are.
I am using an Edelbrock three bolt. It's hard to tell how "identical" these carbs are unless you know that they came from the same year, car, truck because there are so many variations. The castings I am using are identical, all with the same main internals (e.g. fuel stack, squirter).
following this....the linkage must be a nightmare ..anyone run this set up on the street? There's an intake for sale locally... ...tempting
depending on the brand of intake, linkage is pretty straight forward in terms of layout, you run all 4 at the same time with a 4x2 setup.
I'm building a 6x2 Holley 94 on a wiend intake. Almost done with it and ready to test. Oh, and keep the fire extinguisher close at hand!!!
Well, they look like shit with what appears to be a power valve (Spark Valve) sticking out from the base plate that does absolutely nothing for you. The thing with a hot rod is that they do not have an unnecessary part, everything on them is absolutely necessary and functional. Spark Valves aren't. I'll see if I have one and post a photo of it.
no need to do it for me as I know what they look like. But others may want to know. The 1&1/16” ecg is all I run on my cars (obviously can’t call them hot rods anymore) and I am still learning, so thought that I may have missed something. It’s what my fordor came with originally so I stuck with it on my coupe. - Triple 1&1/16” Holleys. If it’s just a visual thing and nothing else, I can live with that……
If you want to run multiple carbs (which this thread is all about), a Load-a-Matic is a poor choice for a distributor. However. this is of no concern here, since the O/P is asking about running them on an Oldsmobile engine.
I don't run power valves on my 8 x 94 setup. It runs good on the street and does 137 in the 1/4 mile. It gets 15 mpg highway cruising if I stay out of the throttle. I've only run it without, So I can't make a comparison. But why use them if it works good without it? I would think a four carburetor setup would operate similarly.
The Jalopy Journal
