Allright I bought by first f-body about a year ago and it's been in the garage for just about as long. I finally got to the point where I have time and money to put in to it. It currently has a 305 with a lower end knock and an overheating problem. This is my plan so far...... I plan on getting a 300hp 350.... from my company advertised specs are as follows.....

displacement 355-358
horsepower 300@5000 rpm
vacuum 12-14hg
torque 363ft lbs. @3900 rpm
compression 9:1
76cc heads probably dart
hydraulic flat tappet cam
valve intake 1.94"
valve exhaust 1.50"
lift (intake/exhaust) (.443/.465")
duration (intake/exhaust) (.280/.290 degree)

Tomorrow I will have the following
EDL-1806 Carburetor, Thunder Series, 650 cfm, 4-Barrel, Square Bore, Electric Choke, Single Inlet, Silver, Each
EDL-21011 Intake Manifold, Performer, Dual Plane, Aluminum, Polished, Square Bore Flange, Chevy, Small Block, Each
HED-17478 Exhaust, Y-Pipe, Black Painted Steel, Chevy/Pontiac, Camaro/Firebird, Each
HED-68470 Headers, Street, Shorty, Steel, Painted, Chevy/Pontiac, Camaro/Firebird, 5.0/5.7L, Kit
MSD-8365 Distributor, Pro-Billet HEI, Vacuum Pickup, Vacuum Advance, Chevy, Big/Small Block, Each

How much of the emissions control stuff can I get rid of and what do I need to cap off or bypass. Also any ideas on what else I should do while the engine is out would be appreciated.

 

Depends on the emissions laws in your area. If you need egr, you could go with a Q-jet carb. If you don't have any kind of inspection, you can pretty much do what you want. All you need is power to your starter, hei, electric choke, and electric fan if you're gonna use one. Also, you'll probably be happier with a Performer RPM or Air Gap intake (if you don't need egr) for that much horsepower.
I'm no expert on this, so somebody chime in if I'm wrong. I still have to do my swap, so I'm only going by what I've read and heard.

As far as things to do while your engine is out: You could degrease the engine compartment and maybe re-paint it. Also, you can check the motor mounts and make sure they're still serviceable. You could also get a new wiring harness if you don't want to mess with the oem. Remove the ecm?

 

I'd recommend you try the stock q-jet, distributor with ecm on the motor first. Alot of people on the boards have had good luck and performance with this system (including me). Would save you enough to get your hedders coated...

You can use your ecm/carb/dist and remove as much of the emissions as you'd like. Your air system will be gone with the hedders. EGR is about all that's left. I use vortec heads which don't have the provision and the ecm is simple enough so that the computer doesn't care.

If you dump the ecm and have auto, you'll have to add some method to control your converter lockup.

Do a search, there's tons of stuff on here about the 305 to 350 swap with ccc-qjet.

 

First of all I'd like to thank you for your suggestions.......
but since I already have an edelbrock avs 650, a polished performer non-egr, and an msd hei distributor......... the distributor should use the same connections as the oem.
What kind of problems am I going to have to overcome by using the avs in place of the q-jet especially in regards to the ecm.

 

Your biggest problem using the edelbrock in place of the stock ccc-qjet will be control of converter lockup. You'll be ditching the ecm all together. You should be replacing your dist with a mech/vac advance one that won't use the existing ecm connections. These connections won't function anyway with the ccc-qjet gone.

You can leave the ecm in place, disconnect it and remove the service engine light.

Your lock up can be controlled by a vaccuum switch. You can do a search for some part numbers that will save you money compared to the painless or B&M kit.

Cruise control also receives data from the ecm, but there may be a fix for this.

There are those on this board that will argue that your biggest problem switching the ccc-qjet for an AVS will be loss of performance and driveability. I've no personal experience with the edelbrock carbs but would be curious to know if you're able to consistently net 18-20+ mpg with your combo when you're done.

 

Cut your losses and sell it. Get an aftermarket EGR intake if you like. You may be able to use your non-EGR intake, just hook up the EGR solenoid so the ECM doesn't get silly. With those low-compression 76cc chambers, you shouldn't have a problem with moderate-load/mid-throttle pinging often experienced with non-functioning EGR.

True, but you don't need to do it.

Performance, driveability, economy, emissions-legality.

Use the stock q-jet. You'll be dollars & miles ahead. Get/make a dual-snorkel air cleaner. Upgrade the ignition module and coil.

By the way, any particular reason for the huge chamber heads?

 

Never hooked my egr solenoid up (87) and no problems. Only detonation I get is if I give it too much throttle (3/4 or more) before the choke has time to open fully. I need to learn not to do that.

I'm using the performer manifold because I didn't want to have to go drop base. I wanted to leave room for a dual-snorkle set up later (running open now).

Why not try the ccc-qjet and oem dist for a while and swap to your other parts later if you still think you need to. That way you can let us know how the two set ups compare.

 

question : By the way, any particular reason for the huge chamber heads?

Well I'm getting a good deal on the engine because I work for the company and those are the heads they install....

question : Why not try the ccc-qjet and oem dist for a while and swap to your other parts later if you still think you need to. That way you can let us know how the two set ups compare.


I can try the qjet to start with...... but it's been sitting for a while and prob. needs to be overhauled...... which I'm clueless on how to do..... Is it hard to rebuild a qjet??

 

Not hard, does require a little investment in time to learn to set it correctly. Probably no more time than you'd spend on a mechanical carburetor tune in reality. There was a recent post on the ccc-qjet,

https://www.thirdgen.org/techbb2/sho...hreadid=344576

can get you started.

 

I'm removing the harness for the ecm from the passenger side of my 86 ta and there are only two concerns I have.

1. the yellow and black wires for the temp sensor on the water neck are in this harness. Do I need this sensor??

2. the four wires that go to the transmission are part of this harness. I already have the B&M TCC lock up kit for the converter will that replace the purpose of these four wires??

If I need to keep these six wires how do I get them out of the connector that feeds through the fender well??

I have done many and have looked through many post could not find exactly what I was looking for.

 

http://www.popularhotrodding.com/eng...cks/index.html

I plan on emulating this buildup as much as I can. They don't mention anything about disconnecting the ecm or modifying it at all so that is my only worry in real world application. Any thoughts or recommendations from anyone regarding the ecm with this engine buildup?

 

im going to go against the gain here and say if you've got the parts why bother putting the original cc carb and ign back on? with the vac advanced msd hei and non cc carb the ecm has nothing to do with the engine anymore. recearch the tuning of your particular carb and you said you have the trans covered. he asked what can he get rid of.

 

Because it will cost you more to use them than to keep the original CC carb and sell the unnecessary parts on eBay.

 

i give ya that but the guy seems like he wants the looks of the aftermarket stuff on there. a shiny carb and polished intake with less clutter. and the performance has got to be at least as good as the qjet and stock manifold if not better.

 

I'd agree except for the "if not better". The AVS carb won't be better.

But, I'm not much into bling. So, I suppose I should leave that part to those who go for shiny.

 

I spent some time browsing AZ over the weekend and am feeling the allure of 'shiny stuff' myself. Hope I'm better in a few days.

 

Hey guys whats gonig on..... i have everything installed and bolted up the only problem I'm having now is over heating issues.... well thats another board hopefully I'll be able to figure it out soon.

 

Check your timing and fuel mixture. If either is off it can cause over heating. Shiny is good.

 

Check the air dam.