emdoller

Is there a way to tell an original 3810 Holley from a new one from Holley?

Ed

JohnZ

Yes - baseplate configuration, date stamped on choke air horn, primary metering block number, slotted vs. hex bowl screws, etc. Original 3810 below.

emdoller

Thanks John. Do you know when Holley started remanufacturing the 3810?

I'll check mine this weekend and my guess is I'll have a few questions but can post pics of the one in the car as well as the one I have in a box.

Thanks again.

Ed

JohnZ

They made them as Service replacements for several years after 1967, and have made several runs of them in the 80's and 90's.

Mike67nv

Here are a couple of shots of my service replacement 3810 for comparison to John’s original. You can see some of the differences John pointed out. I don’t know the exact date of manufacture because the carb wasn’t date stamped, but it was purchased in 2006. I had talked with a Holley technical rep this summer and was told their last run (quantity 100) of 3810’s was sold to Specialty Parts Warehouse in Alabama. I had called them thinking I might be in the market for one and they still had some in stock.

emdoller

Thanks! I'll check this weekend and let u know. Hard for me to see the difference but when I see what I have it might be easier.

Ed

emdoller

Well I think I may have both. The one on the car looks like a replacement but the one that was sealed in plastic and rebuilt in 1992 looks original.

Here are pictures. The first two are the carb on the car (hex bolts, no date code)

The rest are from on that was sealed and stated it was rebuilt in 1992.

It looks like John Z's original.

My questions are:

1) Does it look original? My car is stamped October and delivered in December. Not sure if this carb matches or not.

2) if it is original and it was rebuilt in 1992 (it was sealed in plastic in a box) should I put it on or do you think there may be issues because it's been sitting so long? If you look at the pictures where it looks like some of the color is coming off, there was very fine white powder on those areas - I guess from sitting so long.

On the car...




In the box...

Mike67nv

Ed:

I would agree that the one on your car (first pics) is a service replacement. The one in the box appears to be an original version from what I can see. The date code 672, if I’m reading it correctly, translates to 6 = 1966, 7 = July, 2 = second week. If the second week of July 1966 is before the build date of you car, it could be the original carburetor.

emdoller

Thanks. The code on the boxed carb is 602 not 672. Does the 0 mean October? What's your thoughts on using it as is?

Ed

Mike67nv

My mistake. Yes, a zero in the second position of a three-digit date code would mean October.

If it was stored after being rebuilt in 1992 and never used, it might be be just fine. A carburetor is not that difficult to change, so you might want to try it.

Bay67

The stored one looks real. It is a shame it wasn't stored properly. Not n expert on them, just learning myself, but it looks like a nice carb. What you see is moisture damage (oxidation). It is very likely that what you see on the outside is also similar on the inside. If everything moves freely it will probably be Ok. Looks like you have a nice engine compartment. The price of a restoration might be worth it. last restore 20 years ago. You start of fresh and it will look like JohnZ's carb (well wort the effort).