#1  
Old 02-11-2024, 03:50 PM
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Default Canít say I have seen 1 of these before

Well wandering around the racer swap meet at
Seattle raceways yesterday
I stumbled on 1 of my 2 purchases

Any idea why this wasnít stamped??

Thanks
Scott
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  #2  
Old 02-11-2024, 04:31 PM
JSuchma JSuchma is offline
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I don't know the reason for never being stamped; I have owned about 3 over the years just like it.

  #3  
Old 02-11-2024, 09:02 PM
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Seems to be a 7028264. In cognito

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Old 02-12-2024, 04:34 AM
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Looks "remanufactured". No idle bypass air, added vacuum tube passenger side on throttle plate, slotted screws to hold throttle plate, brass idle needle screws.
May have started its life as a 1967 SR unit.

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Old 02-12-2024, 12:37 PM
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Agree that it's remanufactured, but there are a few things about the throttle plate.
68 throttle plates have the added vacuum tube for the thermostatic vacuum switch, and they also have three mounting screws.

The manufactured date is usually stamped on the left side of the throttle plate just forward of Scott's picture.

Did late 67 engines use the same vacuum set up as the 68s? I thought I read somewhere that they had something similar. If this was a 67 SR that would explain the throttle plate vacuum tube.

Or did someone (rebuilder) cobble up a throttle body to work on a 68 engine?
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1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express

  #6  
Old 02-12-2024, 03:25 PM
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A couple more pics
Thanks for the input
Iím feeling all 68 except the long
Fuel line nut.
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  #7  
Old 02-12-2024, 03:42 PM
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for a while the SR fuel bowls were not stamped.

I have seen a couple;
I have one right now which was stamped (probably by a dealers tech) for the application it was used for.

According to my information that is a 1968 Pontiac fuel bowl.

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Carousel Red paint on Black standard interior
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Quite likely one of few '70 Muncie three speed Formula 400's left.


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2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #8  
Old 02-12-2024, 03:43 PM
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that throttle body casting number was used for 1969 & 1970 Pontiac Quadrajets.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #9  
Old 02-12-2024, 04:13 PM
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Quote:
Originally Posted by unruhjonny View Post
that throttle body casting number was used for 1969 & 1970 Pontiac Quadrajets.
Do you have a list of casting numbers used on Qjets?

I searched for this info online a few times but gave up. There are Delco docs online with PNs for each carb application, but these are assembly numbers and don't list the casting numbers they are machined from. Making it worse, these assembly PNs were not stamped on the finished assemblies...

Obviously this info would be VERY helpful to identify Frankencarbs and yours is the first post I've seen that suggests some knowledge exists.

Maybe it would be worth starting a thread and building such a list (at least for Pontiacs) from those willing to help on this site?

Mike

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Old 02-12-2024, 04:21 PM
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When I first looked into this, I had found that there are people here who have this but they were tight lipped because of the prevalence to fake applications;
Because these other persons had been so tight lipped, I have been compiling this information for myself for the last decade or more.

This is why I will always speak up when a query about a carb is made - assuming I haven't been beat to the punch.

I am hesitant to publicly share this information in the manner you suggested - simply put, this would make it too easily publicly searchable for the EXACT same reason as why others before me wouldn't share the same information to begin with.

Hopefully this makes sense.

I started looking for certain applications when I first made an eBay account back in 1999 - and even at that time, there was a consensus that a great deal of the 'Ram Air' carbs were fake;
As an example, most of the 7040273 carbs were re-stamped 7040263 ect...

The fakes have gotten better - but if you keep tabs on the casting numbers, often those are the dead giveaway... that and too much "gold" zinc plating

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)

Last edited by unruhjonny; 02-12-2024 at 04:29 PM.
  #11  
Old 02-12-2024, 04:28 PM
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Quote:
Originally Posted by unruhjonny View Post
I have found that there are people here who have this, but they are tight lipped because of the prevalence to fake applications.

Because these people are so tight lipped, I have been compiling this information for the last decade or more.

This is why I will always speak up when a query about a carb is made - assuming i haven't been beat to the punch.
Interesting....thanks

Knowledge is power, but in this case, I speculate the benefit of hiding the info would be retaining the power to deceive others (my cynical opinion) and a good reason to make the info public.

Given that, I commend you for using the info to help others!

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Old 02-12-2024, 04:30 PM
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/\ I believe we have gone over this before.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #13  
Old 02-12-2024, 05:16 PM
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Ahhhh, I didn't read through your last post and I apologize.

Thanks for explaining the rationale and for watching out for others.

Mike

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Old 02-12-2024, 05:17 PM
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no problem - I ended up editing it, to elaborate a bit better.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #15  
Old 02-13-2024, 05:10 AM
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Quote:
Originally Posted by Scott Thelander View Post
Well wandering around the racer swap meet at
Seattle raceways yesterday
I stumbled on 1 of my 2 purchases

Any idea why this wasnít stamped??

Thanks
Scott
How would you rate that swap meet?

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  #16  
Old 02-13-2024, 05:58 AM
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Quote:
Originally Posted by OG68 View Post
Agree that it's remanufactured, but there are a few things about the throttle plate.
68 throttle plates have the added vacuum tube for the thermostatic vacuum switch, and they also have three mounting screws.

The manufactured date is usually stamped on the left side of the throttle plate just forward of Scott's picture.

Did late 67 engines use the same vacuum set up as the 68s? I thought I read somewhere that they had something similar. If this was a 67 SR that would explain the throttle plate vacuum tube.

Or did someone (rebuilder) cobble up a throttle body to work on a 68 engine?
Yes, since the casting number on plate is used 1969-70 and all 1968 plates are drilled for idle bypass air.
I have never seen a 1967 using the ignition vacuum retard system, but i guess these also uses idle bypass air to keep the throttle blades in a proper position to the off-idle slots.

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  #17  
Old 02-13-2024, 06:17 AM
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Quote:
Originally Posted by Scott Thelander View Post
A couple more pics
Thanks for the input
Iím feeling all 68 except the long
Fuel line nut.
Not 1968 at all.
Itīs a remanufactured "frankencarb" with all signs of beeing a 1969 unit from the start, possibly a 1967 SR unit made 1969 (with added vacuum tube on side to mimic a 1968 part).

Remaints of "remanufacturers" tag on bowl. Holley or Tomco most likely.
1969 style choke blade shaft and blade (screws sits further apart).
1969 casting number on throttle plate.
Throttle plate not drilled for idle bypass air (1967 only).
1969 secondary stamping on bowl starting with 37xxx
1968-up fuel inlet nut.

HTH

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  #18  
Old 02-13-2024, 06:06 PM
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its ok
200 venders lots of go fast stuff that doesnt interest me
good weather
last year I bought a 70 m-22 that is nice inside for 600
so you just gotta go
just never know

this year a carb for 30.00 and a nice 50 chev hood emblem for 10,00

passed on a decent m-20 660 case for 550

  #19  
Old 02-15-2024, 02:45 AM
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very nice carb, i have a 69 - 428 original carb to share... not sure helps

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  #20  
Old 02-15-2024, 12:19 PM
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that could also be a 7028270 ect...

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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