Okay in the attached links are the pictures for my questions: http://i104.photobucket.com/albums/m177/utter_milk/100_1141.jpg http://i104.photobucket.com/albums/m177/utter_milk/100_1145.jpg ^^THE OVERALL QUESTION: WHAT IS THIS CARB!!!! Off of the choke horn I got these two numbers 9948 0837, went to Mortec.com, couldnt find anything, went to holley, couldnt find anything. I have taken this carb off and cannot see any other numbers on it. Any pictures would be helpful. Help is definitely needed. **Note: there are three vacuum ports at the front of the carb, two 7/32 ports and a 3/8's port, then a small 7/32 on the secondary on top behind the choke.** http://i104.photobucket.com/albums/m177/utter_milk/100_1140.jpg ^^What is the small vacuum hose going to that I have capped off for the secondaries? do I need it? What is the threaded pipe that sticks directly out the back of the electric choke? it is threaded, don't know what it is... could it be a breather? Should I cap it off? Can I?
Sorry this is the correct one 650 Spreadbore http://www.pirate4x4.com/tech/billavista/PDFs/New%20Jun%202003/holley%20numerical%20listings.pdf
Well I found out that it is (#4175) Holley 650 w/ electric choke and vacuum secondaries. Thanks very much sdluck. Now my question is: What is the threaded pipe that comes off the back of the electric choke that points towards the firewall? Any ideas?? http://i104.photobucket.com/albums/m...k/100_1140.jpg
The fitting on the choke housing is a vent line . It is used to keep the element from overheating. It should be hooked up to the black capped fitting above the choke. The carb came with a short piece of metal tubing and a ferrule and nut to hook it all up. Nobody reads the instructions that come in the box...BTW some current production carb instruction sheets are posted on Holley's website. Dave Just checked Holley website.. closest carb I found is # 9895. They use an electric element where the Qjet may have had a hot air choke (air pulled from the upper tube , down thru the exhaust crossover( @ the block off plate held on by the allen bolts ,just under the choke) and back to the threaded fitting on the choke housing ) ..Some Qjets have hot air, some electric...Looking @ your pics I would stay with the electric set up..And plumb it the way I mentioned above ! Good luck...
^^This came on a project that already had the carb on it, there is no telling how old it is either (all I know is that it was rebuilt before I traded for the truck), so I wouldn't have had a clue without the instructions. OH and thank you, thank you, thank you so much for the info, I greatly appreciate it! I will try and find what I need and get this puppy ready to fire up soon. Thanks everyone
Its a direct replacement carb for someting my dad has one just like it on a 350 buick motor ,Ill get back to you with his numbers ,Note No adjustments on floats ,Also carb works off of a well choke .....
the spread bore Holley 4bbls are a replacement for a Q jet, they are prone to problems like developing leaks in the float bowls. I ran one for a few years on a big block in my suburban, but gave up on it when I found a good Qjet to replace it. Not one of Holley's better carbs.
As usual Mr Forbes, you are correct ! Give me a good old 1850 any day ! ( or better yet a 4776 ! ) Dave
What do you mean a leak in the float bowl? the float itself? around the gasket to the metering block? what? Any ideas on where to find that tubing to go from the electric choke to the breather?
There are some plugs that cover the ends of drilled p***ages in the outsides of the float bowls, they develop leaks when the carb gets old. I can't see the tube connection at the back of the choke, can you get a better pic of it?
Wouldn't some kind of gas tank sealant prevent it from leaking if I dab a little of it on there? Below are the pictures you requested, for some reason my camera isnt focusing. sorry about that. http://i104.photobucket.com/albums/m177/utter_milk/100_1156.jpg http://i104.photobucket.com/albums/m177/utter_milk/100_1157.jpg http://i104.photobucket.com/albums/m177/utter_milk/100_1158.jpg
My holley book shows the 9948 is a Qjet replacement for the 76-77 chevy pickup with 350 engine. My guess is it had a heat tube type choke originally, and someone replaced the choke coil with an electrically heated one. I'd probably put a cap on the threaded fiting...a compression fitting nut and the right size steel ball or metal disc or something would probably work. If it doesn't leak at from the bowls, great, use the carb. If it does leak, I'd find something else.
Great, I will just cap it off then, Thanks for the help squirrel I am very close to getting it so I can drive it around. This only gets me closer!
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