Use the timed port. My Edelbrock 1406 has two ports; on the left (facing engine) is the timed port and the right is manifold vacuum. Instructions say the timed port is for '.emissions controlled engines' and vacuum port is for '.non-emissions controlled engines' making one think the manifold vacuum would be correct for (in my case) my 67 327 since it's a non-emissions controlled engine. Not so, with manifold vacuum you get full vacuum advance at idle and with timed port there's no vacuum until you get in the 1200-1500 RPM range. Instructions go on to say, "If your distributor has timed vacuum advance, you will hook the vacuum hose from the distributor to the passenger side vacuum port on the new carburetor. If it has full vacuum advance, it will be hook up to the driver side port." Except for maybe street use with a very large cam, everyone I've talked to says to use the timed port.so I do.
Dale McIntosh <http://www.chevellecd.com> 1966/67 Chevelle Reference CDs ChevelleStuff.com <http://www.chevellestuff.com> <http://www.chevellecd.com> _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Johnny Palmer Sent: Monday, May 21, 2007 5:30 PM To: The Chevelle Mailing List Subject: [Chevelle-list] Fw: Vacuum advance ----- Original Message ----- From: John <mailto:[EMAIL PROTECTED]> & Chris To: The <mailto:Chevelle-list@chevelles.net> Chevelle Mailing List Sent: Saturday, May 19, 2007 3:54 PM Subject: Vacuum advance Is it better to hook the vacuum line from the distributor advance to the timed port or the steady vacuum port on the carb..???...My friend and I are having a discussion on that and either one of us are completely sure..Just wanting some other input.. Thanx.. John Palmer 66 Malibu 327 4 speed _____ avast! Antivirus <http://www.avast.com> : Outbound message clean. Virus Database (VPS): 000742-0, 05/21/2007 Tested on: 5/21/2007 6:42:52 PM avast! - copyright (c) 1988-2007 ALWIL Software.
