[mf67gto]

I have what I assume to be a vac center tri-power carb with tag #7024175 and bowl casting #7043785 that I have had for about 40 years under my bench. Got it from a Chevy dealer cleaning out old parts stock. Never been on a car.

I found this on the Carb shop site - Center carburetor (S/T – 389) 7024175 (airhorn casting 7017917, bowl casting 7019927, throttle body casting 3530) but the bowl casting number does not line up and I cannot find the airhorn casting number - maybe under the vac bracket?

Any ideas on what this is and value? Have not attached pics before, so I have tried a few.

Any help appreciated.

Thank you

[Dick Boneske]

The bowl, #7043785, is not a number I've seen on any of my Pontiac Tripower carbs. The 7043 indicates it's a newer casting than the "correct" 7019927, which most '61-'65 Pontiac Tripowers used, except the automatic version which was 7019929, which had the idle vent on the back side of the bowl.

Does it have the "1 1/4" number cast on the top of the venturi area? Most Chev carbs were marked "1 3/32", which corresponds to venturi diameter.

I also have a NOS center carb like yours, but the "929" version with the rear idle vent, hence the #7024173, which is a '64 center carb for an automatic GTO or big Pontiac.

[mf67gto]

Dick - Looking down the venturi I do see a 1 1/4 stamped in the casting. Also on the tag below the part number is the number "72"?
I looked again this morning with better light and that bowl casting number looks like I posted. Are there any other photos that would be helpful?
Thanks,
Matt

[carbking]

The tag and the Phillips head screws may be the key here, along with the bowl casting number.

The tag should have a 2 character date code in the format "letter number", where the letter would represent the month, and the number the last digit in the year. Example A4 would mean January of 1964.

I cannot read the number in the picture, but it appears to be "72". Possibly 1972???

Also, Rochester did not start using Phillips head screws until the late 1960's.

The original 7024175 tags were black. Yours is red.

So, what you MAY have is a NORS (new old replacement stock) unit; produced after the original production run of the car. Not at all uncommon for replacement carbs to have different castings.

Jon.

[mf67gto]

Yes CarbKing that is a "72" under the 7024175 part number on the red tag. It does make sense based on the year I got it from the dealer in mid 70's to be a "NORS" as you suggest. My basic question is how do I advertise this accurately to sell? I want someone to put it to good use on their tri-power car. My '67 will not require it.

What would be a fair price - not sure how many folks use the vacuum system on GTOs vs the all mechanical?

Appreciate any feedback from yourself or Dick, or others more knowledgeable than me!

[Dick Boneske]

Does the float bowl have a flat front side or are there two "dips" cast into the front surface? I've had some center carbs that were like that. The "927 & 929" bowls are smooth in the front.

Can you send a picture of the front of the bowl? I've attached a picture of my NOS center carb (left side) next to one that I restored. The dichromate fades with age. Note that the restored one does not yet have the choke plate installed.

Being that it is a new, unused carb with ID for a '64 GTO manual shift car, I think $400 would be about what it's worth. I've sold some of the "normal" ones for $350, restored. Yours would have to be recolored to use in a show car quality Tripower.

[mf67gto]

Thanks Dick,
Here is a pic of the front of the bowl and also a side version showing the vac hardware. Appreciate the value evaluation too. I'm trying to clean 40 yrs of stuff I'm not going to need on my '67 build.

[Dick Boneske]

Yes, just as I suspected-- that's the same pattern on a few center carbs I have or had. I'm going to check to see if the casting number matches the 7043785 that you have.

I'll keep you posted. Thanks for the info.

[carbking]

Generally speaking, service carbs are of desirability to those with"drivers" rather than show-cars.

Have not had a Pontiac tripower service carb.

Have sold a couple of dozens Chevrolet tripower service carbs that were new old stock, at approximately 1/2 the price for a restored original.

When selling these, I sell them as service replacements, with the caviat that they would lose points if judged by a knowledgable judge.

The most common Pontiac service carbs seem to be 1967 Q-Jets. Sell them at 1/3 the price of originals.

Hope this helps.

Jon.

[mf67gto]

Thanks Jon - very helpful