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

**dmjlambert** · 12-26-2017, 11:28 PM

I started advanced and have been retarding it a little at a time. I got to the point of having just a little bit of pinging, and adjusted it again and took it for a test drive. It is running smooth and all the pinging is gone. So, I just wanted to see where I ended up by using a timing light. I ended up at 7 BTDC. My vacuum advance provides 23 degrees of advance when connected to manifold vacuum. I have connected the distributor to ported vacuum and I'm going to drive it that way for a few days and see if I like it.

12-26-2017, 11:28 PM	#9
dmjlambert Senior Member Join Date: Apr 2016 Location: Cypress, TX Posts: 3,581	Re: Questions about using a timing light I started advanced and have been retarding it a little at a time. I got to the point of having just a little bit of pinging, and adjusted it again and took it for a test drive. It is running smooth and all the pinging is gone. So, I just wanted to see where I ended up by using a timing light. I ended up at 7 BTDC. My vacuum advance provides 23 degrees of advance when connected to manifold vacuum. I have connected the distributor to ported vacuum and I'm going to drive it that way for a few days and see if I like it.