The Ford Barn - View Single Post - Manifold vacuum at idle... vs without...interesting observations

69a · 01-18-2021, 03:53 PM

If you set your timing at 0deg at idle with vacuum disconnected as soon as you connect the vacuum line you have 14deg advance at idle. WTF. SBC dizzy is designed to have the vacuum line connected above the throttle body. I have had a SBC dizzy for 35 years starting with a Mallory twin point. Then HEI. Standard HEI has about 20 mechanacal advance all in at 2500rpm. Perfect for a Flathead

01-18-2021, 03:53 PM	#16
69a Senior Member Join Date: Aug 2020 Posts: 145	Re: Manifold vacuum at idle... vs without...interesting observations If you set your timing at 0deg at idle with vacuum disconnected as soon as you connect the vacuum line you have 14deg advance at idle. WTF. SBC dizzy is designed to have the vacuum line connected above the throttle body. I have had a SBC dizzy for 35 years starting with a Mallory twin point. Then HEI. Standard HEI has about 20 mechanacal advance all in at 2500rpm. Perfect for a Flathead