I have a 1975 351w and want to install a new 2bbl carburetor and wanted to know what I should look for and also stay away from. I have the original carb on right now. Just wanted to get some input on what brand I should use. My engine is pretty much stock. I would like someting that might give me a good power boost. Thanks... Matt
To get a "good" power boost you will need more than a carburetor but the best carb for a two barrel 351W is the Holley 500 cfm two barrel. You will have to take the jets down up to five sizes for a stock engine. They are a racing carb set to run rich.
+2 on the Holley 500. Holley also makes a 350 cfm 2 bbl that's more oriented toward the stock applications. The 500 will give you a boost over a stock carb. I've run 2 of these on 4 different engines and they all gave good results.
+3 on that carb Id save the money on a carb tho... and get an intake, headers and a small cam and carb
Thats the carb I been looking at also. Do you guys know where I can get a new Automatic choke carb? Should i just rebuild my motorcraft one?
You can get an electric choke kit for the Holley. I just put a manual choke on my 80745-5 which came with an electric. I swapped the electric choke onto an older version of the same carb - an 1850-1.
You shouldn't even need a choke with a Holley 500. Give her two pump shots with the gas pedal and it ought to fire right off. If it won't idle, your ignition tuning is off. First thing I do with all my Holleys is remove all traces of the choke mechanism. If you do still want an electric choke, I'll send you a box full of em if you pay the shipping. Like PaulS said the manual & electric Holley chokes are fully interchangeable between carbs.
So what out of these choices would you choose? http://www.jegs.com/p/Holley/743827/10002/-1 I am looking for a carb I can just bolt on and not have to do alot of changes to. My carb right now has an accelerator pump am I correct in assuming that these do not. They seem to look very different from what i have.
If you want gas mileage, go with a 350 cfm. If you want a boost in power, go with the 500. The only part you'll need to modify is the fuel line to the carb. This is true for both carb sizes (they each use different fuel bowls) it's no big deal though. With the 500, you may get away with a longer section of rubber hose from your present line to the carb. Same is true for the 350, unless you want a cleaner look, then you can cut the metal line shorter and use a shorter section of rubber line to the carb. As for the accellerator pump, both the Hollleys have em. The 500 has a bigger pump, that's the main cause for decreased mileage with it. Both are straight forward bolt on's in place of the Autolite 2 bbl except for the fuel line.
Try pony carburetors. I would love to but a new autolite 2100, but I'm short on cash so i rebuilt one. Have a look at their site. They claim the 2100 and 4100 will blow away anything holley has made in terms of tunability, reliability, and performance. You can change your jets and set your floats without removing your carb or losing any fuel, just take the top off.
You can change both too on a Holley without loosing fuel. All it takes is a little redneck ingenuity. As far as those other claims, both Holley and the Autolites are equals. They're both basically the same carb.
different atomization altogether, but they look similar. I set the float on mine today while it was running, can't do that with a holley.
I do that on my Holleys all the time - they should always be set with the engine running - That's why they have external float adjustments. You don't even have to "take the top off", or remove a fuel bowl.
Never had the need to reset the float on my Holleys after doing it with the carb apart. But as PaulS said, it can be done.
