Vac advance hose - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sapmap · 10-10-2003, 03:02 PM

Where should the vac adv hose hook up.

1981 GMC Sierra C1500, w/Stock 86 GMC 350, HEI ignition?

**swervin ervin** · 10-10-2003, 07:01 PM

I think stock they are on the passenger side front, at the top. Mine had a teed port there. Anyway, hook it to a port that has vacuum at idle. This will raise your curb idle because it will raise the timing at idle.

10-10-2003, 03:02 PM	#1
sapmap Registered User Join Date: Oct 2003 Posts: 4	Vac advance hose Where should the vac adv hose hook up. 1981 GMC Sierra C1500, w/Stock 86 GMC 350, HEI ignition?

10-10-2003, 07:01 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	I think stock they are on the passenger side front, at the top. Mine had a teed port there. Anyway, hook it to a port that has vacuum at idle. This will raise your curb idle because it will raise the timing at idle. __________________ Mike 1985 Chevy C-10

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