The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Need Advice! Do I Need a New Camshaft????

Atlfan65 · 11-19-2019, 02:26 PM

And I didn't have enough vacuum line to run the vacuum gauge into the cab while driving to see my vacuum level at steady cruise, but in park it advanced the timing up to 60° total at some points while revving it to 4000 rpm. 32° total with vacuum at idle and 60° at some points is way too much right? I didn't hear pinging at idle but with header leaks it's hard to hear... I should be looking for about 50° total with vacuum under light cruise right? And how the hell could it add more vacuum advance while revving in park then it is at idle with a higher vacuum signal?

11-19-2019, 02:26 PM	#56
Atlfan65 Registered User Join Date: Aug 2018 Location: Auburn Posts: 22	Re: Need Advice! Do I Need a New Camshaft???? And I didn't have enough vacuum line to run the vacuum gauge into the cab while driving to see my vacuum level at steady cruise, but in park it advanced the timing up to 60° total at some points while revving it to 4000 rpm. 32° total with vacuum at idle and 60° at some points is way too much right? I didn't hear pinging at idle but with header leaks it's hard to hear... I should be looking for about 50° total with vacuum under light cruise right? And how the hell could it add more vacuum advance while revving in park then it is at idle with a higher vacuum signal?