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Holley HP modification for timed vacuum port? #2035467 03/21/16 12:22 AM 03/21/16 12:22 AM
Joined: Oct 2011 Posts: 318 Fort Collins, Colorado C CoDart OP enthusiast
CoDart OP enthusiast C Joined: Oct 2011 Posts: 318 Fort Collins, Colorado	Hi everyone, I just got a 850cfm Holley HP carb for my 440. I was wondering if there is a way to make the carb have timed vacuum advanced as there is not one single port on the carb? Or should I lock the timing out? What im running is a stock low compression 440 with a HP cam. Thanks in advanced!

Re: Holley HP modification for timed vacuum port? [Re: CoDart] #2035470 03/21/16 12:24 AM 03/21/16 12:24 AM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	You can take it off the metering block if you know where to look and what to do.

Re: Holley HP modification for timed vacuum port? [Re: CoDart] #2035684 03/21/16 01:08 PM 03/21/16 01:08 PM
Joined: Jan 2003 Posts: 31,041 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,041 Oregon	You can buy a new base plate with a timed vacuum port. They aren't super expensive.

Re: Holley HP modification for timed vacuum port? [Re: CoDart] #2035740 03/21/16 02:17 PM 03/21/16 02:17 PM
Joined: Mar 2007 Posts: 3,281 West Coast, USA jbc426 master
jbc426 master Joined: Mar 2007 Posts: 3,281 West Coast, USA	What do you have the initial and total timing adjusted to now without the vacuum advance? I always use manifold vacuum with great success. Last edited by jbc426; 03/21/16 02:20 PM. 1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)

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