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
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
main problim is backfire through carb or 'dead spot' when secondarys
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.
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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