The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

xrcr · 12-01-2009, 08:47 AM

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.

12-01-2009, 08:47 AM	#4
xrcr Registered User Join Date: Dec 2008 Location: Foristell, MO Posts: 418	Re: Exhaust popping 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.