I have a holley spread bore that came in the trunk of a car I purchased. Can anyone tell me how to identify it? I dont know if it is a 750, 850 or so on.

post the list numbers located on the choke air horn.

The #'s are 6210-8 and the #'s below that are 1178

It's a 650.

Don't spend any money on that carb. Most of that line of carbs have non-adjustable floats and the parts are one-off of most other Holley carbs.

tom

I agree.

Give that carb to someone you really don't like.

Thanks for all the help. I will leave it in the box where I found it. Thanks again. Kevin

Well I disagree as I have run spreadbore Holleys exclusivly for years. Before going to the 800 spreadbore that I'm running now I ran a 6210 for a long time on my GTO and before that a 6853 Competition series spreadbore till I flat wore it out. I have run them on the street and strip and when set up properly are an excellent carb, it just takes some time and care to set them up. In fact I still have a 6210 that I'm going to rebuild to put on the 69 Pontiac Custom S that I'm going to build for my wife, not the greatest carb for gas mileage but the performance will be there whenever it'll be called for. Granted the floats are non adjustable on the 6210 but they can still perform as they have mechanical secondaries and standard Holley cams and jets will work with no problem but the design of the discharge nozzles are the only drawback I have found bu tI plan on doing some experimenting on the 800 when I get my new engine built next year.

I also run Holley spreadbore carbs and I have a 6210 and 6213. The floats on the 6210 ARE adjustable but you have to remove the bowls to do it. I have been working with Holley carbs since the late eighties and I think that the spreadbore is a hard carb to beat when compared to a squarebore especially for street/strip. I raced with a 4777 - 650 double pumper squarebore - and had it tuned as close as I could get it and then I swapped to the 6210 - 650 double pumper spreadbore - and shaved time off of my ET...I forget exactly how much-too many years ago- but the point being with the smaller primaries the throttle response was incredible and with those huge secondaries - look out. SO, before you go tossing a great carb on the shelf, at least try it at the race track and get some real time slips and then try something else and see how it compares. I know that all engines/cars are different and some will work better with a squarebore or spreadbore, but you personally have to try it to really know. Remember, any carb is junk if you don't know what your doing. Parts are as easily available for spreadbores as they are for squarebores. I currently run an 800 spreadbore doublepumper and it is extremely consistent and very reliable. OK, I'm done...I just had to get my 2 1/2 cents in here.

Ok now were are talking. I have a weep coming from my front accelerator pump, I replaced all seals and even emery clothed the aluminum to make sure things are square. I installed it back on my car, ran good. But after about an hour of sitting time, I had gas on my manifold. The carb did not leak when running or after shut down, but when it sat, that's when I got the accumulation of gas. Thats why I was wondering if the car was actually salvagable.

I've found that the el cheapo acc pump gaskets tend to leak a lot so get one that actually comes in a Holley box. If you can find the GREEN ones, they tend to work better. Don't tighten the screws down too tight because they are easy to strip, but just snug them up and go around and snug them up a couple of times...small steps. If you have a good Holley acc pump then just watch it for the next few days and see if it stops leaking on its own.

The ultimate Holley spread-bore!

Yea baby...That is one HARD to find carb right there. Model 3160 three barrel list number 3916 and it flows 950cfm. That is a bad boy Holley.

It's on my daily-driver Willys coupe! Bought it brand new in ~1970 as a college student. Really couldn't afford it but couldn't resist it either! We have quite a history of roads cruised ever since.

Actually they appear on ebaY all the time and are surprisingly affordable.

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I did buy the original holley gaskets. Still having the problem!