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| | | | Joined: Apr 2008 Posts: 127 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 127 | 65 stepside. New 350 crate motor from summit. Carb rebuilt, new wires, plugs, coil. Anything above idle starts to miss. Dwell right at 30. Timing tried 4 to 10 no help. Any suggestions welcome | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Try it with the vacuum advance disconnected. I have found these engines run rough when they get a lot of advance.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | make sure there isn't crossed plug wires. | | | | | Joined: Aug 2013 Posts: 568 Shop Shark | | Shop Shark Joined: Aug 2013 Posts: 568 | I would ditch the vacuum advance all together. Especially if it's an edlebrock.
Last edited by Hollow65; 01/23/2014 4:26 AM.
I can explain it to you, I can't understand it for you.
| | | | | Joined: Oct 2013 Posts: 98 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2013 Posts: 98 | So its a points distributor? Try another capacitor/condensor they'll affect it; is the coil overly hot? its' easy to get a mismatch with the coil and ballast resistor nowadays and the ignition will pull too much current and act all wonky.
I recall an ohm reading of about 4 - 4 1/2ohms is about right - i can easily be wrong, maybe somebody else can chime in on it. The coil will be less than an ohm and the ballast resister is sized to the coils' resistance. back in the day the local napa had all the right stuff laying around and took care of you and you didn't even have to know about it, nowadays you're lucky to find a ballast resistor of any value.
just a thought.
A shop is where you wash your hands before you pee.
| | | | | Joined: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | Timed port vacuum, or manifold vacuum? It does matter. Crossed or damaged wires? Bad gasket at carb to manifold. Loose points, or reluctor...The list can go on and on. Fix 1 thing at a time. Test and continue until you find it. FYI, Coil and ballast are matched by resistance. If the coil reads 2 ohms use a 2 ohm resistor. If the coil reads 4 ohms then use a 4 ohm resister. How to tell an internal resisted coil? If it still has markings it will tell you if it does not...I don't know.
Steve H
| | | | | Joined: Sep 2001 Posts: 581 Shop Shark | | Shop Shark Joined: Sep 2001 Posts: 581 | How about doing a power test? At warm idle, pull plug wires one at a time and listen for the RPMs to drop. Any cylinder that doesn't drop isn't producing any power, and has an issue. (duh).
-Michael | | |
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