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  #1 (permalink)  
Old 09-22-2002, 11:57 AM
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Post Intake/rough idle question

I have rebuilt street HP SBC, Crower 500 lift Cam, Rochester Q-Jet and a Edelbrock Victor Jr. Intake. On the Highway it's very, very fast but at idle it wants to die. The Stall Converter is somewhere around 2200, the Cam needs 2500 min, is this the problem? I'm putting in a 2800-3200 B&M in a couple of weeks or is the Intake which is a 3500-8000 RPM Intake too big?
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Old 09-22-2002, 12:22 PM
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BOTH.

You need more stall.
The intake RPM range is off. You never could turn it 8000 and it live. Put on a dual plane intake good for 6500 RPMs and the truck will run vastly better.
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Old 09-22-2002, 02:45 PM
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Your idle problem is related to tuning, a Quad although a very good carb was never designed for that kind of cam. An Edelbrock or Holley carb is far superior for your application and you will likely gain some power to boot. Quads just do not have the support of variable components to adjust them to particular applications.

I have run Victor Jr. intakes with 850 DP holleys and .550" lift cams on the street before with no problems, the carb is the weak link in your setup...change it and spend some time getting yoru new carb dialed in.
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Old 09-22-2002, 04:23 PM
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And thats final!!!
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Old 09-22-2002, 04:26 PM
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I knew the converter was at least part of the problem. I'll try the Torker or Vortec Intake. A buddy has a Holly 750 I can use, I'll try that. Thanks guys.
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Old 09-22-2002, 04:44 PM
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Vortec intake???I think the Vortec intakes have a funky bolt pattern or no center bolts or something like that.
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Old 09-22-2002, 04:46 PM
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Really? I didn't know that one. What about the Torker?
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Old 09-22-2002, 05:26 PM
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Dion: That's a good looking truck you got there, I have a '72 cheyenne super just like it (same color and all). I'll never sell it!
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Old 09-22-2002, 05:30 PM
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She's only a Cheyenne with super trim and goodies, see pics on this site. Can you email pics of yours? I want to see! aikidojiujitsu@yahoo.com
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Old 09-22-2002, 05:47 PM
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As soon as I can, I will e-mail you some pics, as soon as I clean it up that is (daily driver).
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Old 09-22-2002, 07:23 PM
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I'll agree with 4 Jaw on this one. Your not tuned properly. Your Q-Jet will work, but you'll have to drill some small holes. The idle feed hole should be opened up to .036", and you should open up the idle mixture screw hole orifice to .090" Also, you should drill the idle by-pass orifice to .095". This will let it idle with a bigger cam up to around 235 deg duration at .050, but if your not in the mood for all of this hub-bub you can buy a Q-Jet from the carb shop, tuned to your specs, or use a Holley, Edelbrock or Barry Grant - whatever floats your boat, but remember you will need to fine tune anything you buy.
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Old 09-22-2002, 09:00 PM
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As for the Vortec.If I'm correct the vortec heads have no center intake bolts And the 1986-up S/Bs have the bolts angled differantly.So if you got the old style heads you have to use an old style intake the Torker should be fine.I've never had Vortec heads or intake but I recall hearing that.
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Old 09-23-2002, 05:19 AM
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78 Monte's right about that Vortev stuff. I've been looking for new heads for my SBC and due to my new found liking of the vortec heads, learned a lot about them. You do in fact have to have an old style intake for them, because of the bolt patterns, and the runners don't quite line up right either. However, right now, you're at an advantage because there are SO many more different non Vortec intake applications available.
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Old 09-23-2002, 12:39 PM
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A guy could sure get confused reading some of these posts about vortec heads????
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Old 09-23-2002, 12:46 PM
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I was talking about Intakes. My engine builder insists the set up will be fine with the bigger stall converter. He's going to dial it in tomorrow, the Q-Jet needs to be recalibrated to run properly, so he says. If it doesn't improve with the converter I'll switch to the Torker air gap intake and a different carb.
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