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Old 04-20-2013, 11:35 PM
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Chev 350 rebuild starting/timing issues

I rebuilt my 1980 350 with Keith black pistons, e-tec heads making 9.7-1 , rolling thunder cam I234* E238* , MSD street fire distributer, air gap intake, 650 ede carb. What kind of initial idle timing should I have? With vac advance disconnected and plugged this engine will not start unless i give it a crazy amount of advance (about 30 degrees I think) then it will run till its warm and dies out. I have tried everything between 10 and 18 degrees. Do I need to modify the centrifugal advance in the distributor?

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Old 04-21-2013, 12:20 AM
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Quote:
Originally Posted by Lucychev View Post
I rebuilt my 1980 350 with Keith black pistons, e-tec heads making 9.7-1 , rolling thunder cam I234* E238* , MSD street fire distributer, air gap intake, 650 ede carb. What kind of initial idle timing should I have? With vac advance disconnected and plugged this engine will not start unless i give it a crazy amount of advance (about 30 degrees I think) then it will run till its warm and dies out. I have tried everything between 10 and 18 degrees. Do I need to modify the centrifugal advance in the distributor?
Have you verified TDC ? If so, your timing isn't the issue, it should still start and run without that much advance, and shouldn't stall after warm up. What the pn# for your cam? How old is the Carb, pn# for that too. Has it been touched? Assuming those are your "at 50" numbers then I would try it at 24 initial, 34-36 total, no, you can't use your stock timing curve, it must be modified to get a 10 curve.
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Old 04-21-2013, 12:23 AM
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Nvrmnd, edelbrock roller, found it. Try the 24 at initial and see what it does. I still think its a Carb issue tho.
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Old 04-21-2013, 12:37 AM
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It's a ede 1406 carb. So how would I get A constant 10 degrees out of my distributor if that's what you mean, is there a way to lock it into place?
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Old 04-21-2013, 12:39 AM
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Don't kno how old the carb is but it ran fine before I did my mods
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Old 04-21-2013, 12:50 AM
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bygddy beat me to it, but here is the correction procedure for setting up the static ignition timing so that you can time the motor with a light.....
http://www.crankshaftcoalition.com/w...op_dead_center
I'd bet a nickel to bucket of dog doo that your damper is junk.
Personally, with the cam you're using, I'd use 16 at the crank when you get the whole mess sorted out, 20 in the weights with a slow chamber, 18 in the weights with a fast chamber, all timing in by 2800.
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Old 04-21-2013, 08:45 AM
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Chev 350 rebuild starting/timing issues

Read this Wiki article on Limiting or locking the mechanical advance mechanism. http://www.crankshaftcoalition.com/w...EI_distributor The Msd Street Fire will be set up just like the GM HEI. Adjust the initial timing after you have adjusted the idle transfer slot on the primary throttle blades. Use enough initial timing so the engine will idle around 800-850 rpms. If the initial timing is 24* BTDC you will need to limit the mechanical advance to 12*-14* BTDC for a total of 36*-38*. You will then have to limit your vacuum advance to 12*. The Crane Adjustable Vacuum Advance Kit is the best to use IMO. Be sure to read the Wiki article it has all the information you need in it.

Last edited by cdminter59; 04-21-2013 at 08:47 AM. Reason: correction
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Old 04-21-2013, 08:58 AM
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I agree with bygddy/tech, 20 ish static timing.I tend to use a couple extra s with a hydraulic flat tappet than a solid.Your engine will tell you what it likes.
buy a strip kit for your carb
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Old 04-21-2013, 11:24 AM
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give it all the base timing it needs 24 to 26deg base at idle.
Modify-limit the centrifugal advance as required to achieve this. 10-12deg mechanical timing curve.

Then use ported vac advance and a 10-12deg vac advance curve too.

teh 650 edelbrock carb will need a bit of jetting work to get it right.
Make sure the brace is on your GM starter motor

24-26 at idle ...........34-36 at max mech advance

+/- 10-12deg vac advance at high speed cruise as required.

The HEI is easy to modify.
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