My 66 327 300hp 4spd carb is leaking at many of the gaskets. What is a good direct replacement carb? The forum and web searches are not giving me a direct answer. It's a driver and I'm noy going to have it judged!

Thanks in advance.

 

If it is the correct carb for your engine why not just rebuild it?

 

I bought R66 and it had a generic 1850 Holley 600 cfm on it installed by the "mechanic" that prepped it for an estate sale. It appeared straight out of the box, but was running extremely rich. I ended up lowering the floats and tuning the carburetor to the 300 hp / 327 as best I could, but never seemed quite right.
The original Holley 3367 was in a box behind the seats. I spent two weeks rebuilding it - flattening the baseplate and gasket surfaces, putting throttle shaft bushings (brass and nylon) in and inspecting, cleaning, and adjusting everything. When I got it back together, it was absolutely amazing how much better the car runs. I have always preferred the Carter AFB (now Edlebrock) or street use on my Chevys, but GM knew what they were doing when they matched the 3367 to the 300 hp / 327. I recommend finding a reputable rebuilder.
But if you wish to swap it out, either a 1850 Holley 600 cfm vacuum secondaries or the 600 CFM Edlebrock #1405 will bolt on with fuel line and choke modifications. You will need to fine tune it to your car as they are jetted for generic use and generally rich.
Good luck
Ron

 

I had a similar experience as Ron. When I got it, my '67 300hp coupe came with a Holley 1850 on it. The original 3810 carb was long gone. A previous owner had connected the carb to the fuel pump with rubber fuel hose, and installed an electric choke to replace the stock bimetallic spring setup. Well, that rubber hose started leaking one day when I could smell gas during a drive. I pulled over to see gasoline flowing onto the intake manifold. Not good! I replaced that hose and then had the 1850 rebuilt because the car was prone to stalling when coming to an abrupt stop and hesitated under acceleration. The rebuild helped some, but a rough idle and other issues gradually drove me nuts. I finally bucked up for an original 3810 from one of the Corvette vendors (about $700 back in 2020). Wow - what a difference that made! The car finally ran as it should.

I'd say don't bother with that Holley 1850. Toss it and buy the proper 3367 carb that your Corvette was engineered to run with. Another advantage is that a new carb is likely to have soft parts compatible with the ethanol fuels sold today. If you have the 1850 it's probably plumbed to the fuel pump with rubber hose, and has an electric choke. Dump that stuff and install the proper metal fuel line from the pump direct to the carb. It's available and cheap. You can also buy the bi-metallic spring choke kit for little $. Go stock and you won't look back!

 

My car runs great, it just leaks. Took your guys advice and just ordered a rebuild kit.

 

You can do a basic gasket refresh yourself. Don't use the plastic washers for the bowl bolts. Save the original paper gaskets if you can. Hope you ordered the blue gaskets, they are better quality than the brown or old cork. Pretty common for a Holley to leak after setting 3 or 4 months, most of the time you can just tighten the screws 1/8 turn or so to snug them up.
This link will give you help if you need it: https://www.holley.com/support/carburetor/
Or, there are some smarter people than me on here that can bail you out if you get stuck.
Ron