Any Holley Spreadbore experts here?
 

I found this carb on E-bay and suspect its someone's Frankenstein. https://www.ebay.com/itm/23413443158...UAAOSwH41hFKqw
Ive never seen a 650 spreadbore with race bowls on it. The list # is 6210 but that number doesn't exactly come up in my Holley reference book. The book shows 6210-1, 6210-2, and 6210-3 but no 6210 by itself. And those do not have race bowls. Any thoughts? If its real I want to buy it immediately. Thanks

The dash 1 etc are later releases of the original 6210.

I have used the 6210 a lot. It is a great carb. (for 650 size). I have also used the 800 spread bore Holley.

The jets and power valves make it nice to modify. (no secondary jet plate like 3310)
The spreadbore does use a tube to connect the jet block to main body is the only 'problem' I have with it. Which isn't a real problem.

I think it will be a good buy.


:)

A friend of mine converted his bowls on his. Nothing crazy difficult.

That’s a common conversion to get rid of the small fuel volume and that dinky cross over tube that many of even the non spreadbore carbs have.

In fact to me with the big size of those secondary’s even in the 650 spreadbore it should have come from the factory with higher performance fuel bowls!

This one has race bowls. No transfer tube. Does not seem correct for a 650. The 800,s have race bowls but never seen a 650 with them.

Definitely no expert and have never had a 650 but I have had 3 800 spreadbores and you could get one new with dual feed and double pump or single feed double pump. I don’t know for sure but I would guess you could get the 650 the same way.

That would explain this one. I went out to my carb pile and found a 650 spreadbore with the wimpy fuel bowls and it looks like fuel bowls from a 4150 will fit. Unfortunately the metering blocks are different so I would have to live with the reverse idle mixture.

Thanks for the replies everyone.

Is that a 50cc pump on the primary side? Holy crap, she gonna run real rich. Does look like a good carb. for the money. Had a Holley spread bore on my 70 GTO years ago, ran real good.

The more I think about it I’m guessing you could not get the 650 in a dual feed. Looking at the pictures of that carb something about it I don’t like almost looks like it has been painted.

To my knowledge all the 6210's used the side-hung float bowls. They are interchangeable with the center-hung "Lemans-style" bowls which re originally designed for the Ford GT-40, hence the Lemans designation.

I have a 6213 800 cfm Holley Spreadbore I bought to try out and never got around to it. When I did go to install, the center to center distance on the fuel inlets was longer than the normal 9-5/16" on the 4150 series double pumpers. I was going to modify the 4150 line ( trim the secondary feed line and install a 3/8" compression fitting) just to try it out but returned the line instead and lost interest.

You may find the same thing with yours and have to put together a T and rubber lines to make it work or use one of those flexible braided line abortions.

Correction ... my bad. They are pent-roof bowls, not Lemans bowls which had forward and backward facing inlets. Whole different animal.

1) #6213 800 CFM Carbs use "Center Hung Float Bowls that can be swapped on a 650 cfm #6210 carb and metering blocks.

2) The accelerator pump discharge hole from the #6213 "Center Hung Float Bowls" is in a different location vs the normal 650 to 850 square bore carbs bowls.

3) The metering blocks are also different between square bore carbs and spread bore carbs BUT the metering blocks interchange between the 650 and 800 spread bore carbs once you change the Jetting and Power Valves.

4) The Dual Bowl Fuel Line is also unique to spreadbore carbs.

5) All of the spread bore carbs use the "Johnson" (a Holley VP's) primary/secondary double pumper linkage design.

Tom V.

If I wanted it, for $125 I could'nt go wrong. Grab it and figure it out later. You can always re-sell it if you don't like it.:bolt:

You are right. The 4150 bowl will not fit the spreadbore carbs. The hole is just a little off. You wouldn't happen to know what part # those spreadbore bowls are. My book says N/S. Which stands for not serviceable. Must be a typo.

Yeah, the spreadbores are a different casting and 4150 parts won't interchange. The center casting is also stretched to accomodate the secondaries.

I and Cliff Ruggles would disagree with you on his 850 cfm Holley Carb with the 50cc pump on the carb ON THE FRONT.

In some applications if you add the 50cc pump and open up the air bleeds on the primary side of the carb about .004" the set-up is happy with the 50cc pump on the front. I helped Cliff with his carb.

The KRE guys dynoed that Holley carb and they told Cliff:
"Don't touch that carb it is perfect on the dyno."

Tom V.

Tom, that old carb looks terrible! I think you should just send it to me. :) Seriously, that's obviously a nice virgin carb. Nice to see one in mint condition. These carb will flat make some power. An 800 spreadbore double pumper and a 455 4-speed works fantastic. Had a 650 on a 389 when I first started driving. It worked great also.

I have, in the boxes about 40 NOS carbs, that I bought over the years and put away.
A few spreadbores, a few Dominators, somewhere I have about TEN 3-Barrel carbs, some 440 Six Pack Carbs, and several of the "Quarter Mile Dial, electronic carb enrichment" carbs. But they are in storage, I will have to see if they are still there after several years of not going to a relative's place and looking at them.

So there are still virgin Holley carbs out there that people are hanging on to.

Tom V.

Is there any advantage to the older Holleys? You can still buy a brand new 650 SB right? I had one on my 68 GTO for years, thought it was easy to tune, got about 17 mph on the highway. Did have a few quirks but no problem when you got to know them.

You can probably still get a 650 with side hung bowls. The carb that Tom showed has not been available for a long time. Still lots to be had if you don't mind going through one.

Which type bowls/s are you looking for?

Looks like Holley only has replacement for front single line.

https://www.holley.com/products/fuel.../parts/134-110

And you can still get the 6210 new.

https://www.holley.com/products/fuel...t/parts/0-6210

The obsolete dual line conversion kit for these was Holley PN # 34-4.

Clay

1) I still see lots of Holley used carbs at swap meets in the $15 to $35 range.
Most are slightly used but still very good ZINC parts on them.

Holley went from Zinc material Carbs to Aluminum Material Carbs.
Zinc plating will last for many years without issues. A friend of mine who worked
at Holley, with me, still does some "re-plating" using proper chemicals but not
OSHA approved.

But the key deal is that aluminum carbs do not last. Great for a Big Name carb seller.
More sales, cheaper costs, more profits.

Personally I would pay any day to acquire a couple of used Swap Meet Zinc Carbs,
and run them as is or have them plated. Then you have a lifetime carb.

The good Gaskets are still out there, I have hundreds of the good BLUE bowl gaskets
for the 4150 carbs. 4165 and 4175 carb parts (gaskets) much less.

Not a sales pitch. Rarely sell carb rebuild kit parts.

Just saying. The old stuff was calibrated by Carb Engineers who had tons of Carb knowledge.
Mike Urich, Chief Engineer, and book writer being one of them. Mike was a good guy.

So my post here is a carb information post, not specific to this discussion on Spread Bore Holley Carbs.

Tom V.

Im looking for the race bowls. It looks like Holley discontinued them for the spreadbores.

Uh...
 

I was talking about the 650 the OP posted the link to.

"Holley Carburetor List 6210 Spread Bore 650 cfm Double Pumper dated 3343"

Yeah, they're "only" around $750 too.

OK Thanks.

Those carbs at one time sold new for well under $300 at speedshops.

Tom V.

About 20 years ago I bought a holley 650 spreadbore for my TA. Paid a little over $200 for it. Now they are $700. :eek:

Yeah. Around $750 new these days for the 650. Yikes.

No new 800's.

In about 1974 my original Quadrajet died a premature death and I went down to the local speedshop to locate a replacement. Purchased a new 800 CFM double pumper Holley spreadbore on sale for $76 and tax. Don't remember why but he had a massive stack of them and must have got a deal on them from Holley. Ran it for the next 25 years until I went back to a Quadrajet, and probably the most trouble free Holley I ever ran.

The 800 spreadbore was/is a great carb. It's bizarre that Holley stopped making them. With all the GM cars out there that want to run the original style cast iron intake, I would think there is more than enough demand for them.

After going Bankrupt 3 times Holley Carburetor is not the same company that made the excellent 650 and 800 spread bore carbs of the old days.

Their EFI stuff is doing well because NASCAR is using some of their stuff on the cars.
And the EFI stuff is pretty darn good for a moderate cost EFI system.
MOTEC and the other high end stuff being better in my opinion but only for cubic money type vehicles (think land speed record platforms).

That being said there is little that is the same on the calibrations.
The old calibrations for the majority of the "Chevy bolt on carbs" was paid for by GM Engineering paying Holley to do the
calibration work.

Most of the casting work has been farmed out to the offshore countries C*ina

Tom V

So true!