distributor/intake interference question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Boog** · 09-21-2007, 08:48 PM

Alex, forgive me but you did disconnect and plug the vacumn hose going to the vacumn advance when timing it right?

Alex Hayley · 09-21-2007, 09:02 PM

Yes. I did unplug the vacuum advance. That does bring to mind a question from me. When timing by vacuum gauge, should I have the vacuum advance unplugged? Or does it matter at that point since at idle there is no vacuum?

**Boog** · 09-21-2007, 09:12 PM

If it's on ported vacumn it won't make any difference at idle speed.
I 'd say adjust your timing by the vacumn gauge to get the best idle and clamp er down. Then drive it and seen how it performs. If hard starts show up back it down in approximately 2* increments until it starts good again hot.

You know tuning the engine to achieve best idle somehow doesn't make good sense to me since we don't drive down the road at idle speed.

09-21-2007, 08:48 PM	#1
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,684	Re: distributor/intake interference question Alex, forgive me but you did disconnect and plug the vacumn hose going to the vacumn advance when timing it right? __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

09-21-2007, 09:02 PM	#2
Alex Hayley Registered User Join Date: Jul 2000 Location: NC Posts: 987	Re: distributor/intake interference question Yes. I did unplug the vacuum advance. That does bring to mind a question from me. When timing by vacuum gauge, should I have the vacuum advance unplugged? Or does it matter at that point since at idle there is no vacuum?

09-21-2007, 09:12 PM	#3
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,684	Re: distributor/intake interference question If it's on ported vacumn it won't make any difference at idle speed. I 'd say adjust your timing by the vacumn gauge to get the best idle and clamp er down. Then drive it and seen how it performs. If hard starts show up back it down in approximately 2* increments until it starts good again hot. You know tuning the engine to achieve best idle somehow doesn't make good sense to me since we don't drive down the road at idle speed. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross



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