im getting a new holley 4 barrel carb and i want to know what people think is the best one for my 83 z28 with a lg4 engine. right now i got a quadrajet spreadbore and it is a piece of s**t. i hate it. so im gonna upgrade top a holley so what is the best.

 

How about a spreadbore Holley? It will bolt on your Q-jet manifold.Allthough I think the Q-JET properly set-up is a better street/performance carb.

 

I would advise finding out what's wrong with your q-jet. You may discover it is something rather simple, and even worse, find out that a new carb doesn't fix the problem.

Consider also that in order to mount a square-bore Holley, you're going to need a new intake manifold, or an adapter (yuck). And, a mechanical/vacuum advance distributor. Plus, if you have an auto tranny, your TCC won't lock up anymore, so you'll need a switch or kit to restore that function. Finally, your gas mileage will probably be worse with a well-tuned Holley than it will be with a properly-functioning CC q-jet.

Just some food for thought.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ4 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (ported World 305 heads, Crane PowerMax cam, Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

I'll pay for shipping of your Qaudrajet to 64468. Plus $5 for your trouble. Let me know.

Thanks
Clem

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Clem
SCCA TransAm Series Race Mechanic/CrewChief
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1983 Z28 with LG4, 5 speed, and (unfortunately) T-tops
1983 Z28, NO T-tops, (unfortunately) Auto Transmission (hopefully not for long)

 

I dont know why 5,7 hates the adapter plates some of them actually promote HP. If they are the spread bore 4 hole type then they rock! If the are the open or small 4 hole then I can see a problem.

Holleys are good carbs I like em and have them 3 of 4 carbed vehicals I own excluding the 56 buick. I would stay away from the qjet replacment though, Ive heard nothing good about them except they fit a spreadbore manifold.
SSC

 

Really is false economy to trash your (POS)
Q-jet just cause its got a little problem and you don't understand it.
Probabily just needs to be freshened up or some small part has stopped functioning.
Best to repair it rather than replace it with an expensive holley that is at best a universal carb. Meaning it will take carefull tuning, to bring it to within the sharp tune of your original Q-jet. If your car is relativly stock and you want superior
drivability and gas mileage, then stick with the Q-JET. Pick up a book on Q-jets from a speed shop or the library. It will show you what all the do-hickys are on the carb and how to check-fix them. The Q-jet really is a simple "performance" carb with infinent adjustabilty once you understand it.

 

I'd suggest considering a new intake manifold I've got an edelbrock performer intake and I'm sure it helps the engine to breath quite a bit. I know I picked up throttle response and some Hp... A new intake is virtually essential for a real build up.

I agree about keeping the stock carb though, it's really not your problem. Perhaps it needs a rebuild... even replacing it with another would cost near pennies (~$25 - $50 on ebay).

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1984 Firebird - Daily driver, 305 LG4, 3.23 rear, T5 - Hurst short shifter, Edelbrock 600 CFM 1406 carb, Performer intake - Edelbrock Pro-Flow air filter, gutted cat, IROC 16x8 5 Spoke Wheels, AIWA bargain basement (from Sears of course) CD player, Eight-ball shift ****
Check out my ride here

"IT'S SNOWING! TO THE HIGH SCHOOL PARKING LOT!" - The Mustang and Firebird face off in the dead of winter.

[This message has been edited by ChillPhatCat (edited November 03, 2001).]