vacuum advance
Thread Starter
Instructor
Joined: Oct 2001
Posts: 169
Likes: 2
From: Glen Aubrey NY
vacuum advance
I am changing cams in my 77 L48. I labeled all vacuum hoses when I removed them, except for the vacuum advance hose. Can anyone tell me which vacuum port this was hooked to? Is it the one that is in the top of the thermostat housing? Thank You.
Burning Brakes
Joined: Aug 2000
Posts: 925
Likes: 1
From: LT1 and LS5 Coupes... New Orleans, LA
Re: vacuum advance (EarnIt)
No, it should go to the front of the carb to get your ported vacuum. On the two thermostat ports, one goes to the carb and the other goes to the AIR/Heat riser valve. On your other vacuum switch in the intake, one port goes to the carb and the other goes to the EGR valve.
