4 Barrel Carburetor For Rochester Quadrajet Carburetor For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Choke 1901-GG 750 CFM

What AMAZING quality, I have had such probs with my 69 Corvette 427, the mechanic had my factory Rochester rebuilt TWICE and apparently still NO GOOD.I replaced my fuel pump all my vacuum lines and more, and still NO good. So I figured I would order this, I thought at that price I just could NOT go wrong.I installed today, it is 100% IDENTICAL to the stock one, it comes with all kinds and sizes of jets, KUDOS what XLNT company indeed.So installed, pumped the gas 3 times, turned the key and that MASSIVE 7 Litre MONSTER finally came to life, and my God it runs PERFECT, all pre adjusted and set just right. THANK YOU SO MUCH !!!OUTSTANDING Do NOT hesitate on this it's a FANTASTIC value...3 years of the car not running right, and here for under $200.00 ... GREAT !!

Poorly built. Flooded a bit from start and only got worse by the minute. Thought about sending it for warrantee, but needed something soon so took top off it. Right away spotted the main problemNo snap on clip/hook on the needle to hang needle on float. So needle just bounce around under float, and no sign of that wire clip/hook it anywhere! Took one off a GM Rochester Quad needle placed on the China needle, checked float, reassembled. Good to go after. Buyer Beware. May have to fix before have a user. Best just to pull top off and inspect & fix before install. So give it a 1 out of ten. Works after thurally inspecting & fixing what's wrong.

Out of the box runs good. Minimal adjustments will be required to fine tune. Driving down the street as is. Needs a fuzz more fuel. We’ll see long term but short term on point.

Perfect for it's purpose.

After adjusting this carb it is a good carb but it was adjusted wrong. A brass float is adjusted differently than a plastic float. The important thing is to adjust so the high center of the float isn’t touching the top of the chamber. It overflowed after the first time starting it. See a lot of people have this complaint. Then it failed emission standards miserably as delivered. I’ve had the top off of this too many times trying to set it. In the end the #33 jets with the primary jets you installed it passed emissions test. Just took it on a 300 mile round trip without an issue. I installed it on a 454 chev big block 7.4 now I question if the jets you provided could set this carb for a small block since I’ve tried almost every possible setting and only got smoke with every other try. It ran as delivered but not right and if customer isn’t pushing 500 horse power or more then it will not work. Way too much fuel. Great carb very responsive steady power. I’d buy again but knowing it needs to be opened and rejetted and float adjusted not plug and play. Thundermingo have you ever installed on an engine and tried? Not jetted like my stock gm carb came. So buyers open it up set the float properly and install #33 jets and you MIGHT LOVE IT

This carburetor was surprisingly good out of the box. The documentation is rather clumsy and all over the place, but you can find general quadrajet documentation just about anywhere, so reference that for your initial tuning. The float was adjusted correctly and did not have any issues with the upper plate. The carburetor bolted on and started up straight out of the box and required minimal adjustment.It is important to point out that the quadrajet carburetors do not handle high pressure well and these are no exception! I've found that these will take up to about 8psi at most before they push past the needle and seat and cause the leaking you commonly read about. You must either install a regulator to keep your inlet pressures down or run a fuel pump specifically designed to provide low pressure.DO NOT BLINDLY TRUST YOUR FUEL PRESSURE! Many of the aftermarket replacement fuel pumps are putting out too much pressure for the quadrajet, even if it is listed as a direct replacement! Always check your fuel pressures or buy a quality low pressure and high volume replacement.If you are looking for a cheap and basic replacement for your quadrajet and are not chasing peak horsepower numbers, these will work surprisingly well if you set them up correctly.

Carburetor is junk I waited to long before I put it on my truck to find out it was junk to send it back put it on my truck wouldn't run very good then wouldn't start at all pulled fuel line make sure pump was working it was so pulled carb apart wasn't even a wire holding the needle so had to get a new one for that then put back together of course leaked so got carb kit still didn't want to run right after adjusting it then started leaking from accelerator pump it was tore got another kit got it to run little better for about an hour now its leaking out the accelerator pump again probably a bur or something in the hole cutting the rubber so guess I need to figure something else out I've never had this much problems with a carburetor before

I used this to replace the throttle body on my son's K5 Blazer (this along with a 4-barrel intake manifold - engine is a 350 ZZ crate motor). This carb worked right out of the box without any issues. We've not tuned it yet, but signs are promising :o) The carb comes with some spare jets so you can change them if needed.