Hello everyone at Team Chevelle! Five years ago, with everyone's help I restored my '68 Chevelle Malibu Convertible. The car is all stock and sports the 327 - 300 HP engine which was rebuilt at the same time the car was restored.

Since the restoration, the power has been lagging in my engine and it has an annoying sporatic mis-fire. I replaced the plugs, wires, cap, rotor, and have the concealed electronic ignition system unit sold by Year One. Looking at the old plugs, it seems to burn rich and it has a rebuilt Quadrajet on it.

Knowing the reputation of Quadrajet's, I fear getting it rebuilt again for the same problem. I've had alot of problems with this carb in the past, either bogging out or leaking fuel all over the manifold. I am strongly considering going with a new Holley. I am looking for a good, dependable Holley, nothing high performance or needed for the strip, as my engine was rebuilt all stock.

Does anyone have any recommendations on what type of Holley I should go with that will give me a nice tuned engine with stock performance and not pour excessive gas down my manifold? Also, I want to keep the original air breather on it for shows. Can this be done using the Holley? Thanks in advance for any help! (Please feel free to e-mail me, too, at minnocenzi@wdpa.com)

I would look at a spreadbore carb,they hook up with single inlet like the quads do and have vacuum secondaries and would look more at place on your engine,look at summitracing at the 4175 models priced around $300. graemlins/waving.gif

Get the Q-jet done correctly. There is no better carb for a street car.

Do some research at www.holley.com (http://www.holley.com) it's a real good site. Also call their tech line, they know their stuff.

Originally posted by minnocen:

......Since the restoration, the power has been lagging in my engine and it has an annoying sporatic mis-fire. I replaced the plugs, wires, cap, rotor, and have the concealed electronic ignition system unit sold by Year One. Looking at the old plugs, it seems to burn rich and it has a rebuilt Quadrajet on it.

Knowing the reputation of Quadrajet's, I fear getting it rebuilt again for the same problem. I've had alot of problems with this carb in the past, either bogging out or leaking fuel all over the manifold. I am strongly considering going with a new Holley. I am looking for a good, dependable Holley, nothing high performance or needed for the strip, as my engine was rebuilt all stock. Actually, Qj's have a really good reputation. Have you looked into troubleshooting your Qj? A properly set up Qj runs a long time with little trouble, and will probably best a Holley by a couple of m.p.g.s

Originally posted by minnocen:

Does anyone have any recommendations on what type of Holley I should go with that will give me a nice tuned engine with stock performance and not pour excessive gas down my manifold? Also, I want to keep the original air breather on it for shows. Can this be done using the Holley? Thanks in advance for any help! (Please feel free to e-mail me, too, at minnocenzi@wdpa.com) If you go with a Holley, a 600 cfm vacuum secondary is perfect for a 327. The 6619 runs well if you have a mild cam, as do the 1850, and 80457. You'll need a squarebore manifold to run these.

Mike

http://www.holley.com/HiOctn/TechServ/TechInfo/FMCTech3.html

Bubba

Concerning your QJ, did you epoxy the plugs in the bottom of the carb body when you rebuilt it? If the plugs leak it will be a bear to get the engine to run right. And if you are feeding lots of raw fuel to the manifold, you can be causing serious damage to the engine as a whole as the raw fuel introduced even with the engine off could be washing oil off the cylinder walls.

The QJ is a great carb if tuned right. A good rebuild and a touch of epoxy on the plugs are necessary to get you there. You also need to make sure the needles for the jets are properly installed and the proper size for your needs.

If you still want to convert to a Holley, you've already been given some good recommendations above.

I agree with Rich. I rebuilt my Q-Jet on a Corvette, following the TONS of good info in the How To Rebuild Q-Jets book. The plugs were leaking like a sieve. I epoxied them in per the advice of the book, my vette ran better and I picked up 2 MPG without any other changes to the car.