79 drivability issue

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Just took it for another test, its back firing through the carb as soon as the secondarys open. dirtdude wrote:


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How do the new plugs look? Still dark on one side?
Wire the heat riser open. If it still runs hot, drop the exhaust pipes at the manifold, then drive it. Sounds like you may be fighting a plugged exhaust system. Watch out for stuff that will burn with the pipes dropped. Don't hot rod it. You be able to tell instantly if that's the problem.
To test the heat riser, just watch it. It will be closed before you start it. It will open when the engine warms up, just tie it open and forget it for now.
Al
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Didn't see this before.
Real good advice. It may have moved. All info so far points to a timeing issue imho
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If you read my posts in this thread you'll see that the rig has a 2500 mile old true dubble roller chain and gears and top end, the timing is set at 8 before TDC. thanks a lot for your help, what else could the problim be
main problim is backfire through carb or 'dead spot' when secondarys open Roy wrote:

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I read your post. The balancer could have slipped on the rubber, thus your marks could be off Have you adjusted the valves? If so when? Did this just come on all of a sudden? I'd start by locating tdc, and pulling the valve cover's and taking a look. I assume this is a sb. Hell ya could have pulled some studs. Really, it is time to get to basic's rather than throwing stuff at it.
R
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dirtdude wrote:

Possible causes as I see could be 1) plugs improperly placed18436572 starting right bank front 2) head gasket or broken ring---compression or leak down check 3) frozen vaccuum advance hope it helps..........
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What type of timming chain and gear did you install. Did the crank gear have three keyways. Bought a motor that the gear was put on with the wrong mark. Run like hell.
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Have you put a light on it? Sounds like it might have jumped a tooth or two.
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