I'm trying to find a 14" offset  dropbase air cleaner base for my '75. I need about a 1.25" to 1.5" drop as I'm using a Performer RPM intake under my stock hood. I need the offset to clear the HEI. I currently have a standard 1.25" dropbase that clears the hood OK; it rubs against the HEI though. I found this one: http://www.allstarperformance.com/product.htm?prod=1385 which says it fits Edelbrock carbs but not ones with a choke. Other ones I have found don't have much of a drop and I'm afraid won't clear the hood. I can always go with a 10" round (which I don't really wan)t or one of those triangular ones (again, which I don't really want). Just wondering if anyone had solved this problem. You'd think someone would make one.

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Greg, here's what I did.  I copied this from a PM I sent to another member that inquired about my air cleaner:

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Greg I had the same problem. I was able to use an extension ring on top of the carb. I still had to rig it so it would fit. I have to make sure that the cover is screwed in tightly or the bow tie screw I have rubs the hood.

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Dave C..........My mantra: I can not be bought!!      Long and short term leases available.

Thanks Dave and Dave (lol). Some food for thought there. I may buy the base I mentioned and try to modify it if needed. It isn't very expensive if it is a complete failure. Nothing ventured, nothing gained they say.

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Spend enough time on the internet and you usually find what you're looking for. I found this picture of the Allstar offset base installed on a '69 Vette with an Edelbrock carb with an electric choke. Looks like the choke flapper is missing but in the next picture I can clearly see the black choke housing. I'm going to order it.

http://www.hardskull.com/images/offset.jpg

http://www.hardskull.com/images/base.jpg

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That carb not only has the choke plate removed, it also is missing the secondary air valve, which is similar to a choke plate, but is weighted to stay closed until the velocity of air rushing over it opens it up. That's one of the main differences between the  Carter AFB(Aluminuminum Four Barrel) carb and the Carter AVS(Air Valve Secondary).

That's a neat off-set cleaner base! Just be careful that you don't wind up with the air cleaner top sitting right on the top of the choke housing of the carb. You need a bit of space between the top and the carb for air to be able to get into the carb. Another thing, wih the air cleaner moved forward, the front edge of it is going to be even closer to the bottom side of the hood. With the '75, that means you should have the cowl induction hood, so be sure to check and see if it will all sit where it needs to be, and still be able to close the hood.

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Joel Adams
C3VR Lifetime Member #56    
My Link


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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Will do Joel. This base has .25" more drop than my current one so I think hood clearance will be OK. If it doesn't work I'm out $25 + shipping. Might be able to modify it if needed as it's aluminum.

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I read that 3 times and still can't figure out what you did.  Glad it worked...what ever you did. 




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Gary, if you look at Dave's pic in his sig, you'll see the filter he described. Basically, it is the original base, and top, but the base has been cut down on the outer circumference to to diameter of the filter itself. The original base is/was huge, since the early '76 cars still had the cowl induction hood/air cleaner assembly. All he did was trim the base down to a smaller diameter, and use a shorter filter element.

Here's what it would have looked like originally...




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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Gary: I cut out the bottom of my original big old GM closed element housing and used it as the drop base for a 12" air filter element.  What I ended up with was just a 12" diameter plate that sits on the carb air horn and drops the element down an inch or two.  On top of the element I used a stock-style air cleaner lid from a '73-'75.  ('76 and later used a closed element system - my original lid was too big).

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Joel and I posted at almost the same time.   Joel, you're absolutely right, except I think you might have assumed I have an early 76 that came originally with the cowl induction.  It actually came with the closed element system, but it doesn't really change the story at all.  I think the air cleaner elements were the same dimensionally between the two designs.....

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I received the air cleaner base the other day and installed it. Works perfectly and clears the electric choke and throttle linkages just fine on the Edelbrock 1806 carb. It clears the hood on my '75 even better then the base I had before.

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Glad it worked, Greg!  Any pics available yet?  

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Here you go Dave...

http://i180.photobucket.com/albums/x247/Case24_photos/IMG-20140210-00322_zpsd1be48a1.jpg

http://i180.photobucket.com/albums/x247/Case24_photos/IMG-20140210-00323_zpsc00c0573.jpg

http://i180.photobucket.com/albums/x247/Case24_photos/IMG-20140210-00324_zps422c5de2.jpg

http://i180.photobucket.com/albums/x247/Case24_photos/IMG-20140210-00331_zps6de0c30c.jpg

|UPDATED|2/11/2014 3:56:58 AM (AZT)|/UPDATED|


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

  O.K. Gents. You have conquered a dilema in that area, NOW, does the same possibility exist on a '72 with an even lower hood line. I would like to remove a Q-jet that no one seems to be able to keep working correctly, and put on a E-brock with the needed plate under it. I know my options are next to nill, but am getting discourged.

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Click on image for full view

If you install an Edelbrock 2101 Performer intake you won't need the adapter plate which would keep things a bit lower. It should fit fine under the '72 hood. The reason I needed the drop base is I'm running a 7116 Performer RPM Vortec intake which is higher than stock.



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Send your Q-jet to Lars (the Corvette Forum guy).  He is a master with the Q-jet.  Just post a thread asking about it in the C3 section.



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Click on image for full view

I had a similar problem with my '72 after I had my engine rebuilt and swapped out the original worn Q Jet for a new Holley & HEI ignition. The stock [my preference] twin snorkel air cleaner would not fit so I had to go aftermarket but to fit under the hood plus clear the HEI distributor I had to get a recessed air cleaner base and adjust it's location until it cleared the Holley throttle & choke fittings. I still had clearance issues with the wing nut so I ground it down until it longer touches the underside of the hood, it has a 3 inch filter. It's not exactly the result I wanted but it does look Ok..

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