TMP Carbs 4150 series double pumper carbs for 2x4 FE setup?

[cjshaker]

660’s are for sale new, they are just really expensive.

https://www.summitracing.com/parts/hly-0-4224/overview/

Yikes! I have a really nice restored pair for a current project. Glad I picked them up several years ago in a package deal!

[BattlestarGalactic]

Pair on the black car cost me $300 on fleabay and came with full Holley kits to rebuild.  Still going strong after 7-8 yrs now.
I have another pair, near new, that buddy gave me to play with.   Someone messed with them, nothing tragic, but they need full gasket kits.

[Drew Pojedinec]

They are pretty darn cool when finished:

IMG_0918 by Drew Pojedinec, on Flickr

[427LX]

With the gap between the secondary shaft roller and the linkage plate...how does the throttle positively close the secondaries other than the spring?
What are the stock air bleed sizes on the 4224?

[Drew Pojedinec]

The spring is strong, plus airflow closes them as well. The throttle shaft does not go through the center of a plate, it’s top heavy so Air is always trying to close them.
You want calibration info? Lemme dig out my laptop, stby.

[Drew Pojedinec]

Ok, now to understand what you are dealing with, you have venturi that are smallish, around the size of what you'd find on a 600cfm carb.  But the throttle plates are what a 750cfm carb like a 3310 would run.  The lowest end of the venturi is enlarged so the throttle plates clear.

List number         4224-s
Type            4160 660CS
Primary
Float            Side hung brass
Booster            .144 Straight leg
Pump nozzle         .025 Center Squirter
Pump type and cam      50cc Cam #336 whitish orange
Idle air bleed         .070
High speed bleed      .028
Metering block#         5913
Main Jet         76
Power valve         none
PVCR            na
Emulsion         2 @ .026 each side
Kill Bleed         none, emulsion tube, .028 feed
Idle Feed restriction      .038
Needle and seat         .110
Venturi size         
Throttle plate size      172/173

Secondary
Mechanical or Vacuum?      Mechanical roller
Spring color         na
Diapghram length      na
Float            Side hung brass
Booster            .144 Straight leg
Pump Nozzle         same as primary
Pump type and cam
Idle air bleed         .031
High speed bleed      .021
Metering block/plate#      12
Idle Feed Restriction      .031
Jet size         .076
Needle and seat         .110

You can see the venturi here:
IMG_0835 by Drew Pojedinec, on Flickr

IMG_0876 by Drew Pojedinec, on Flickr

[Posi67]

Drew..  Have you ever put a set of 850 baseplates on 660's? Seemed to be a fairly common modification years ago and when I called Holley they told me it was impossible. Well, I had a local guy do mine. It wasn't cheap and I don't think I gained anything for the money. May just have been the motor didn't need more carb. Comments from others welcome.

[Drew Pojedinec]

No I haven’t.
Seems that the restriction is at the entry to the Venturi, not the exit.
I think if more air was needed, it’d make sense to look there.

Of course there is an 850cs. So that is a possibility. They are fairly rare, but I’ve seen sets around for a reasonable amount.

[mike7570]

https://www.ebay.com/itm/1969-Holley-4223-S-850-CFM-Carburetor-Center-Squirt-Date-9-7-5-Camaro-Corvette/302869320125?hash=item46846b11bd:g:zK0AAOSwtItbY1LL:sc:FedExHomeDelivery!92868!US!-1

[falcongeorge]

Tom has been around for quite awhile and knows his stuff. Like any salesman he’s going to say his is the best while not giving away and “secrets”. Never used his carbs but wouldn’t be afraid to try.

Ditto. Assuming someone doesn’t know that he knows what he is doing, based on an abrasive, slightly sociopathic personality is a common, and sometimes fatal mistake.... some of the sharpest people I have met in this business are not people I would want to live next door to on a bet. Doesn’t mean they don’t know EXACTLY what the hell they are doing. My original mentor would fall into this category.
But I agree, Troy is ummmm, “difficult”.

[427LX]

Here is one of my 600 cfm 1850 carb bodies with my 15 degree cut for the 750 base plate...basically a 650 now. They have been running really well with the vac. secondaries.

I've got something a bit different in the works and should know by Sunday if it works as planned!

[427LX]

Ok, now to understand what you are dealing with, you have venturi that are smallish, around the size of what you'd find on a 600cfm carb.  But the throttle plates are what a 750cfm carb like a 3310 would run.  The lowest end of the venturi is enlarged so the throttle plates clear.

List number         4224-s
Type            4160 660CS
Primary
Float            Side hung brass
Booster            .144 Straight leg
Pump nozzle         .025 Center Squirter
Pump type and cam      50cc Cam #336 whitish orange
Idle air bleed         .070
High speed bleed      .028
Metering block#         5913
Main Jet         76
Power valve         none
PVCR            na
Emulsion         2 @ .026 each side
Kill Bleed         none, emulsion tube, .028 feed
Idle Feed restriction      .038
Needle and seat         .110
Venturi size         
Throttle plate size      172/173

Secondary
Mechanical or Vacuum?      Mechanical roller
Spring color         na
Diapghram length      na
Float            Side hung brass
Booster            .144 Straight leg
Pump Nozzle         same as primary
Pump type and cam
Idle air bleed         .031
High speed bleed      .021
Metering block/plate#      12
Idle Feed Restriction      .031
Jet size         .076
Needle and seat         .110

You can see the venturi here:
IMG_0835 by Drew Pojedinec, on Flickr

IMG_0876 by Drew Pojedinec, on Flickr

Thanks for posting the 660 specs!

[427LX]

The 660 carbs,like the model 1850 600, share same 1 1/4 and 1 5/16 venturi sizes. Wonder why Holley didn't open up the primary venturi to 1 5/16 for a bit more flow?