Can I put a non ECM controlled HEI on an LG4 and still use the CCQ-jet? I am going to take the engine off computer control but will keep the Q-jet on it if it still runs. Otherwise I will put a Holley on it. WDYR?

 

Run? Yes.

Run properly? Absolutely not.

Why would you consider this? There is nothing about the CC HEI weaknesses that a non-CC HEI would cure. Everything you have to do to a CC would have to be done to a non-CC, and vice-versa.

And, going Holley would require another intake manifold or an adapter - the former isn't necessarily a bad idea, the latter is. Plus, your SES light will come on and stay on, and if you have an automatic, your lock-up torque converter function would have to be re-engineered. To say nothing about a pretty good chance that your gas mileage will go down.

Also, consider the fact that for less money than it would take to get a non-CC HEI and carb going, you could make the CC system sing.

I think you should reconsider your course in its entirety.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, 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).

 

Sing?? How? How do you get around the lame advance curve?

 

If you get rid of any part of the computer system, you need to remove it all. You really need a combination of parts to gain much power. A holley carb and non computer HEI might help a small amount. However, if you add an aluminum performance intake (action plus for example) and a better cam(around 268 duration) with a holley carb and non computer HEI you will pick up some power. Next would be heads. Also, headers will free up some power as well. But if you only want to replace the carb and distributer, you may want to take five7's advice above.


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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, currant red metallic paint. Lots of other stuff...
82camaro

 

Chip change.

Actually, the factory advance isn't all that bad. If you're talking about what you get when you set the timing, that's the limp-home mode, and is lame. The ECM controlled advance usually just needs some more base advance to get it going.

[This message has been edited by five7kid (edited October 11, 2001).]

 

For the least work, go to the junk yard for a non CC distributer... then buy a non-CC Qjet (# 70XXXX or 1705XXX) off ebay for $25 and rebuild it for $20...

 

I can't endorse that. If the CC system is working (i.e., nothing is broken or missing), then the simplist thing is to keep the CC working. Ignition upgrades (which you should do with a non-CC HEI anyway), ignition timing advance, and secondary tuning will be less hassle and less money than going non-CC.

 

I agree with Five7Kid The easiest thing would be to keep the computer, but it wouldn't take too much money at least to switch over... depending on the carb you plan to run (need a spread bore adapter or new manifold).

 

Well that really was the question. I have a non CC HEI that has been curved that I would like to use in place of the CC unit. If I do this, I will set a code - I can get around the SES light by removing it and if the ECM is still happy to control the carb, I think it may be an improvement. I already manually control the TCC anyway so that's no drama. I would prefer to keep the E4MC if I can because it is set up quite well and the vehicle runs great. I always read that the LG4 advance curve is a big reason that this engine is such a slug. A better curve is said to really wake these things up. A non CC HEI with the E4MC seems the ideal solution to me. WDYR?

 

If I can add my .02, I wish it were only that easy. Tried that one on my L69 car, didn't work. The ECM relies on the reference pulses that return to it from the CC dist module in order to meter the fuel (along with all the other sensors & stuff). My carb ran full rich when I had a straight non-CC dist on the engine, accompanied by the proverbial engine light. Same as when you set the base timing and disconnect the 4-wire harness, runs rich; won't meter the fuel at all.

Seems like a good idea if only there is a way to keep those reference pulses going to the ECM.
I was toying with the idea of adding a CC module and 4-wire harness to a vac advance distributor but have been working too much to try and apply the idea. (Someone else wanna try it for me? )



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D.R. Stevens
1984 Trans Am 305HO L69
all the usual external/free mods, original engine
1991 Firebird 305 L03
2 free mods and a K&N,
otherwise stock

 

Thanks for that 84. That's just the info I needed. Did you ever replace the carb and get it to run without the ECM? If so, how was it?

[This message has been edited by PerthZ28 (edited October 16, 2001).]