Which after-market carbs, if any, will fit the stock L69 dual snorkel? JamesC

Anything but dual inlet Holleys & Demons - the ones with fuel bowls that stick out in front & back.

Spreadbore Holleys, for instance, will fit under the dual snorkel, because of their fuel bowl arrangement. I don't know for a fact, but the Demon Jr's may fit under, as well.

The 350 HO Deluxe has a Vortec dual plane intake. Any advice on what 600-650cfm carb might be a good match--which, of course, would fit the L69 dual snorkel (hey, I'm a concrete sequential personality and I think I'm a bit anal on top of it)?

JamesC

Holley 6210

Sorry, I should have added that an electric choke was required. How about the Holley 804557S (single-feed/side-hung float bowls) or Edelbrock stuff, say the 1406 or 1400?

JamesC

Holley 6210 with electric choke kit

Humm, didn't see it. I'll check again. Anything come to mind with vac secondaries (not the best choice, but....)? Advantages and disadvantages to mechanical secondaries vs. vac secondaries?

JamesC

http://store.summitracing.com/

"Holley Model 4175 Carburetors

Quadrajet replacement made easy.

Designed as a bolt-on replacement for GM's venerable Quadrajet, Holley's Model 4175 carburetors utilize a front-mounted fuel bowl fitting, allowing you to reuse the stock fuel line. Other features include your choice of vacuum or mechanical secondaries, an accelerator pump, power valve blowout protection, a spread bore flange, and a choke. They're available in your choice of universal calibration or direct fit replacement versions."

I found three 4175 Holley spread bore carbs that might fit my needs: HLY-0-80555C, HLY-0-6210, and HLY-0-65-1901--should read 9895 (Sorry, I couldn't get direct links to work). Can I assume that any of the three will fit the vortec manifold and also accomodate the stock throttle/Cruise brackets and the L69 dual snorkel?

JamesC

HLY-0-6210

I don't know the other ones, but I know for sure that the 6210 is a "good runner" on a stock or near-stock motor, within its size range. It's even a manual secondary double-pumper, so it's about as good as it gets, for the application at hand. 80555 is vacuum secondaries, as is the 9895. Don't get those. I can't find that other # in Holley's carb list or on Summit's page.

http://store.summitracing.com/partde...HLY%2D0%2D6210

As long as the Vortec intake has a spreadbore flange (Q-Jet) then it will fit.

All you do, is take your stock throttle/cruise bracket, and bolt it under the 2 rear nuts, just like it is now under the 2 rear bolts. Done.

If you have the throttle kicker solenoid, there's a solenoid you can get, and Holley makes a bracket for it, to bolt onto that carb's throttle plate.

There's an electric choke kit avaliable for it.

You might have to drill a hole in the throttle lever for the cruise control stud, or there might be one in the right place; I don't recall. Last one of those I ran in my car, was actually a 6211 (800 CFM version of the same thing), that was VERY old. I think mine was built in the early 70s. It's been updated a time or 2 since then.

The L69 breather will fit. It's tight around the carb, and the throttle linkage comes REAL close, but it fits. In fact, when I had that 6211 on my 400, I added a 1" spacer on top, to get the breather lid up off the air horn; and that even fit under the hood. Barely... but it fit.

OBTW my 400, with a Comp 282S cam and that carb and functional cat & AIR, passed emissions in TN (sniffer at idle only).

I understand your preference for the 6210 with its mechanical secondaries, but will the 80555C and the 9895 fit as well? I ask because though I've searched I can't find an electric choke kit that will fit the 6210. Moreover, though I desire a strong running car, I'm not "terribly" interested in the last letter in performance.

JamesC

They will fit, as far as I know. I had a 9895 on my 79 Z28 for a while. I didn't like it at all. It had far less testicular fortitude than a 6210.

There definitely is an electric choke kit for the 6210. It's hard to tell which one it is from what's on their web site. My late little brother and I put one on the one we put in the car he ended up getting killed in. I'm quite sure that one of the 2 choke kits they make will work on it.

Well, I screwed the pooch on this one. Double-checking, I noticed the Vortec intake accomodates square bore carbs. Bloodly stinkin hell!

JamesC

Thanks, RB

Money, money, and money. Edelbrock makes a Vortec intake that accepts both square and spread bore carb. Crap, replace intake and carb from the Deluxe and the throttle/cruise will bolt up and the dual snorkel will fit. Someone point me toward the money tree, please.

JamesC

OK! how much hacking bending is required to use the demon or the holley 3310?
Thanks Randy

I tried my dual snork on my Edelbrock 1406 and it hit the fuel inlet.So then tried a 1/2in. spacer,wich cleared the fuel inlet but then I could not close my hood.DOH! So i just got a Summit dropbase.

You can't bend, or tweak enough to make a Demon fit. My duel snorkle has been sitting on a shelf for over a year now....

Just for general info (and my general disgust) the 9895 won't fit the dual snorkel.

JamesC

Edelbrock has a banjo bolt design (90 deg) for the fuel inlet and this will not interfere with the air cleaner... I'm running the 1406 on my Blazer and I made a dual snorkel from 2 air cleaner assemblies and I had to get the banfo bolt to make it fit... BTW they sell them at AutoZone/Kragen etc....