The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Pinging after 40-45 mins of driving?

burnin oil · 06-09-2016, 12:22 PM

I am betting the carb is sucking up a lot of heat and giving you a headache. Try putting a phenolic (sp) spacer under the carb and see if that helps. Another thing you can try is disconnecting the vac advance and see if it pings. You may have a can that is pulling in a little more advance than you need. Most people don't realize that the cans have different amounts of advance and vacuum levels needed to pull it in. For instance if the can pulls in 10* at 12"s of vacuum and your throttle is at 12"s then the extra timing won't fall out. Another thing to check is that the fuel line is not touching the radiator hose. Putting 200 degree water in direct contact with the fuel line will heat the fuel up fast.

06-09-2016, 12:22 PM	#20
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: Pinging after 40-45 mins of driving? I am betting the carb is sucking up a lot of heat and giving you a headache. Try putting a phenolic (sp) spacer under the carb and see if that helps. Another thing you can try is disconnecting the vac advance and see if it pings. You may have a can that is pulling in a little more advance than you need. Most people don't realize that the cans have different amounts of advance and vacuum levels needed to pull it in. For instance if the can pulls in 10* at 12"s of vacuum and your throttle is at 12"s then the extra timing won't fall out. Another thing to check is that the fuel line is not touching the radiator hose. Putting 200 degree water in direct contact with the fuel line will heat the fuel up fast.