Exhaust popping

[xrcr]

I'm going to ask a stupid question. Did you replace the plug wires? How about your vacuum advance? I fought this problem with "newer" plug wires and that is what I had it narrowed down to after complete rebuild on the HEI and replacing the vac adv.. Truck didn't idle rough though. I'd double check everything before I did a top end rebuild.Pop your valve covers and check valve adjustment.

[chicklin]

Originally Posted by xrcr

I'm going to ask a stupid question. Did you replace the plug wires? How about your vacuum advance? I fought this problem with "newer" plug wires and that is what I had it narrowed down to after complete rebuild on the HEI and replacing the vac adv.. Truck didn't idle rough though. I'd double check everything before I did a top end rebuild.Pop your valve covers and check valve adjustment.

Entire distributor (which came with a new vac adv), plugs, wires and coil have all been replaced and checked. The plugs are not fouling as far as I can tell, the wires are routed correctly and there is no obvious arcing anywhere.