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Old 06-05-2012, 01:12 PM
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Chevy 350 (what is going on)

Guys got this sbc 350 ....just timed thing and new dist and in gear at idle runs good ...put in gear ..still holds ...press accelerator to go she cuts off then won't start ...so I get her to start go round block but car ain't taking acceleration it's like puttering when it should be accel ...so i put round block careful to keep some acceleration as this thing will surely cut off ....what's going on here

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Old 06-05-2012, 02:27 PM
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We need more info. Fuel problem? Ignition? Bad ground? What did you do to it to make it not drivable?
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Old 06-05-2012, 02:41 PM
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Car was running fine ....installed new dist and had to re time and this s where I'm at with it
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Old 06-05-2012, 03:30 PM
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Re-check your timing? Firing order correct?

What did you take out(type), and what did you install in its place?

Are you sure the coil is wired correctly?

Does the distributor have the right voltage going to it?

Check to make sure you didnt knock a vacuum line off somewhere.
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Old 06-05-2012, 03:59 PM
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I'm thinking timing must be off ......I'm having to advance timing to the max with dist ....hei dist is what I took out and what I put in ....vacuum line is hooked up to the hei canister ........like I said dist is turned as far advanced as it can so maybe I just need to adjust timing on cam itself and go a few degrees before tdc and try that ....is that the way you guys see it .......it's something simple cause it runs good but when put in gear it kills every damn time ...I'm lost and pissed and possibly looking for a sale sign too damn hot for this crap
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Old 06-05-2012, 04:48 PM
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Check the timing with vacuum disconnected.......with atiming light. What have you got?
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Old 06-05-2012, 04:56 PM
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Not at home right now but I will say ...car idles higher with vac advance unhooked but I'm on my way home what should timing be with vac advance unhooked
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Old 06-05-2012, 05:12 PM
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Can't exactly say because my tape is only 12degrees but it looks to be running high 30 to mid 40 degree range ....that's with no vacuum hooked up ...
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Old 06-05-2012, 05:17 PM
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Are you sure your not a tooth off?
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Old 06-05-2012, 05:31 PM
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Quote:
Originally Posted by Dirtdolla
Can't exactly say because my tape is only 12degrees but it looks to be running high 30 to mid 40 degree range ....that's with no vacuum hooked up ...
At idle? If so, that is way high. Base timing should be around 14-15 degrees for fairly stock motor or slightly higher depending on cam and combo. I would look for a vacuum leak if your running that much timing just to idle assuming you haven't tinkered with the carb adjustments since you swapped distributor. Post more info on motor, air cleaner to oil pan, and vehicle it is in and you will probably be able to get more help.
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Old 06-05-2012, 06:04 PM
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This is a crate 350sbc with large cam and pro performance trimmings (previous owner ran as a 1/4 mile car ...it's in a Chevy impala 1962 ....large cam so I set timing at 20 degrees before tdc on cam and looking to get remaining 15 from hei dist as I was told i need to be running about 35 degrees overall got a holley carb ...engine is a 4bbl
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Old 06-05-2012, 06:53 PM
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The idle should not speed up when the vacuum is disconnected from the vacuum advance. Double check the firing order. It's easy to get #5 and #7 crossed.
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Old 06-05-2012, 06:58 PM
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HEI's have a ton of advance between vacuum and mechanical, a lot more than 15 degree's. Is you canister running off straight vacuum or ported? I prefer to run my vacuum advance off manifold or straight vacuum by doing this you can back the distributor off quite a bit and most of the time your idle quality will improve. Why did you change distributors to begin with? Is this a new unit?
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Old 06-05-2012, 07:34 PM
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Some info on ignition timing and timing curves, etc. here.
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Old 06-05-2012, 09:05 PM
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Ok beast you got me ...ported? Straight vac? Guys I must confess ...I'm not a mechanic but I got good knowledge of an engine and how it works ...but when you say ported I'm lost ...this is what I know ...I got two nipples on my carb side by side ...one was hooked to my old hei dist and the second is capped off ...again Holley carb here ..the capped off nipple is bigger than the one I'm pulling vac from ....you true car guys will kill me if only you knew how I got to this point lol
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