Ive got an old Q-jet that i want to rebuild for my camaro, the one with no electric hookups, no computer fuel trim or anything. The stamped number on the body is 17083227, which from what i saw is from an 83 chevy/gmc 305 truck. Will this carb, properly rebuilt, feed my 84 5.0HO z28 with HEI distributor fine? its all stock except the distributor but the carb is leaking air and fuel, it wont idle, and id rather rebuild and use this non computer carb. Will this pass emissions if i have a good cat and get the air/fuel correct? Ive also been told the carb i have will not work correctly with the HEI/vac advance distibutor. Is this true? And if all else...what changes will i have to make to the non-CC carb to make it work well with my HO 5.0?

 

It should work reasonably well in place of your computer controlled one. You will need to ditch the computer controlled HEI distributor and go with an earlier style one with mechanical/vacuum advance mechanisms to go with your old style carb.

 

I already have the vac advance style. I dont think the computer is even in my car anymore or at least the wiring harness isnt plugged into it. None of the plugs have any voltage. I have to pull the kick panel out and look. But will the my air/fuel mixtures be reasonably set for the l69? Im eventually gona replace it with a new carb but ill see how this one goes

 

If the carb is in good running condition it should work well. Carbs ran without computers for 100 years before there was computer control and the one you chose is off another 305 so it should be reasonably close.

 

The non ecm Q-jet will work fine with your L69. If it's a truck Q-jet, it should be an 800 cfm version. I believe the L69 Q-jets were 800 cfm also. Also, adjusting the air/fuel mixture on Q-jets isn't hard.

 

Trucks didn't get 800 CFM q-jets, neither did any 3rd gens. 750 was the typical capability for trucks & 3rd gens.

Some big blocks in the 60'-70's got the larger ones, but you aren't likely to have one of those.

 

You're right,Five7. L69 carbs had diferent metering rods. Hell, I had an '84 Z28 L69. That car's been gone for many moons now. Sorry for the incorrect info. I thought mid 70's trucks had 800 cfm Q-jets, especially if they came with the 400 sbc(like 73-79 Suburbans).

 

Some LG4 q-jets had the AV travel limited, which limited flow to about 600 CFM. But, you could modify them to get full AV opening, which put them back in the 750 CFM range.

I only saw 400's with 2bbls, but they may have come with q-jets later. Even if they did, their terrible heads, cam, & exhaust would keep them from needing any more than about 650, anyway.

 

Later 400 truck motors came with QJets on them. Whether they were 750 or 800 CFM Qjets I can't be sure. I have one out in my stack of parts carbs right now- original off a 74 or 75 400 truck engine. I'll check out whether it's a 750 or 800 CFM unit later.

 

800's were on the big Caddys

 

And GS 455s Pontiac 455 SDs

 

And some 454's.

 

800 Q-Jets came on a lot of vehicles, esp. late versions on trucks. The 252 Buick V-6 had the 800 casting. The difference is the diameter of the primary vehturi. Everything else was the same as the 750. The difference between the applications is the opening of the secondary air flap. The Buick barely opens.
Get the book by Cliff Ruggles and read it

 

which book is that

 

http://www.amazon.com/Rebuild-Modify...3279785&sr=8-1

 

Sorry for the long reply time but I went and checked that QJet off a 1975 truck 400 that I've got on my pile- it's an 800 CFM unit and it's definitely a Chevy.